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Criteria in the Diagnosis of Metabolic Syndrome in Children: A Scoping Review
Authors Díaz-Ortega JL , Yupari-Azabache IL , Caballero Vidal JA, Conde-Parada NE, Rojas Gamboa AF
Received 8 August 2023
Accepted for publication 10 October 2023
Published 3 November 2023 Volume 2023:16 Pages 3489—3500
DOI https://doi.org/10.2147/DMSO.S430360
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Prof. Dr. Juei-Tang Cheng
Video abstract of "Criteria in the diagnosis of MetS in children" [ID 430360].
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Jorge Luis Díaz-Ortega,1,2 Irma Luz Yupari-Azabache,1 Joao Alonzo Caballero Vidal,1,2 Nelson Enrique Conde-Parada,1,3 Abigail Fernanda Rojas Gamboa1,2
1Grupo de investigación en Síndrome Metabólico, Universidad César Vallejo, Trujillo, Perú; 2Escuela Profesional de Nutrición, Universidad César Vallejo, Trujillo, Perú; 3Programa de Nutrición y Dietética, Universidad Mariana, San Juan de Pasto, Colombia
Correspondence: Jorge Luis Díaz-Ortega, Universidad César Vallejo, Av. Larco 1770, Trujillo, 13001, Perú, Tel +51 944897194, Email [email protected]
Abstract: Currently, there is no consensus on the criteria for identifying metabolic syndrome in children, as observed in the diversity of research developed. For this reason, a scoping review was developed in this work, in order to compare the criteria for the diagnosis of metabolic syndrome (MetS) applied in children, described in observational, descriptive cross-sectional studies. The databases PubMed, Scopus, Web of Science and the search engine Google Scholar were used. The search terms “metabolic syndrome”, “cardiometabolic syndrome”, “child”, “children” and “childhood” were considered, as well as the names of organizations or authors proposing identification criteria for MetS to establish search relationships using the Boolean connectors “AND” and “OR”. Likewise, two reviewers carried out the evaluation and selection of articles, of which 26 articles were included in which children aged 6 to 12 participated. It was found that the most commonly used criteria for identifying MetS since 2015 are those of Cook et al, IDF, NCEP ATPIII, and De Ferranti et al, in that order. Specific criteria, such as those proposed by Cook et al, are being chosen to enhance the accuracy of identifying MetS in children. The most common risk factors in children with MetS are abdominal circumference and BMI, followed by triglycerides, HDL, blood pressure, and blood glucose. The prevalence of MetS in children varies according to the criteria used, being higher with De Ferranti et al.
Keywords: metabolic syndrome, child, diagnosis, cholesterol, triglycerides, obesity (thesaurus: DeCS/MeSH)
Introduction
Metabolic syndrome (MetS), also known as syndrome X, is defined by the WHO as a pathological condition characterized by abdominal obesity, insulin resistance, hypertension, and hyperlipidemia, which therefore increases the likelihood of developing cardiovascular diseases.1 The prevalence of MetS varies worldwide, although it often corresponds with the prevalence of obesity.2 However, the relationship between obesity and MetS is not entirely clear, since there are obese patients with and without metabolic disorders and likewise patients with MetS and normal weight.3 It is proposed that obesity can lead to an accumulation of free fatty acids in organs such as the liver, adipocytes, skeletal muscles, and the pancreas. This accumulation can disrupt insulin signaling, which in turn can result in insulin resistance. An early complication of hepatic insulin resistance is the induction of the production of very low-density lipoproteins (VLDL) rich in hepatic triglycerides, particles that are known to be very atherogenic and increase the risk of cardiovascular disease (CVD).4 Sharma et al5 in their systematic review indicate that fluctuations in the prevalence of IR in children and adolescents range from 2.2% in those with a healthy weight to 10.8% in those with obesity, while the prevalence of MetS in children and adolescents varies from 3.4% in normal weight to 29% in the obese group. There are various versions of the diagnostic criteria for MetS, resulting in a heterogeneous population of patients. The definitions vary for children, adolescents, and adults Health institutions such as the International Diabetes Federation (IDF) and the National Cholesterol Education Program (NCEP) Adult Treatment Panel III (ATP-III) have exposed different diagnostic criteria for MetS that include: abdominal obesity, high concentration of triglycerides (TGs), low cHDL, high blood pressure, and altered glucose.
In 2007, the International Diabetes Federation (IDF) published a consensus stating that children aged 10 to 15 met the criteria for MetS if they had obesity with a high waist circumference (WC) > 90th percentile and two risk factors, either high blood pressure ≥130/85 mmHg, cHDL ≤40 mg/dL, TGs ≥150 mg/dL or fasting glucose ≥100 mg/dL.6 This consensus definition also established that children under 10 should not be diagnosed with MetS, but weight control measures should be taken in those children with abdominal obesity and especially in those with a family history of cardiovascular disease. This is explained by the absence of age-specific reference values for the components of MetS for this age group.7
The NCEP-ATP III considered as criteria for MetS in children central obesity with WC≥ 90th percentile in both sexes, TGs ≥110 mg/dL, cHDL ≤40 mg/dL; Blood pressure (systolic or diastolic) ≥ 90th percentile and fasting blood glucose (FBG) ≥ 110 mg/dl.7
Other authors such as Cook et al,8 de Ferranti et al,9 Weiss et al,10 Viner et al,11 have adapted the NCEP-ATP III adult criteria to make it possible to estimate the prevalence of MetS in children and adolescents, differing in the components in the WC percentiles or the use of BMI, percentiles in blood pressure and TG levels or glycemia. In this way, there are still no standardized criteria worldwide due to the modifications proposed by various authors on the criteria and cut-off points for the diagnosis of MetS.
The existing information since 2015 was reviewed in relation to the criteria used for the diagnosis of MetS in children, to know the trends of its application; determine the general averages for the risk factors of MetS in children within the included studies, the average percentage for each of the risk factors of MetS in children diagnosed with MetS, and finally determine the prevalence of MetS in children according to diagnostic criterion, age and sex.
Materials and Methods
Databases
In this study, a scoping review of research in which different criteria for MetS in children were applied was carried out, obtained from the PubMed, Scopus, Web of Science databases and also from the use of the Google Scholar search engine, with the aim of answering the objectives.
Search Strategy
A search was conducted for studies published from the beginning of 2015 to October 31, 2022. The key terms identified in the OPS/OMS/BIREME health science descriptors were used, such as “Metabolic Syndrome”, “child”. The connectors “AND” and “OR” were used to relate the keywords. The search strategies in PubMed, Scopus, Web of Science, and Google Scholar are shown in Tables 1 and 2.
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Table 1 Information Search Strategy in PubMed |
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Table 2 Information Search Strategy for Scopus, Web of Science, and Google Scholar |
Inclusion and Exclusion Criteria
Original articles from the last 5 years, freely accessible and/or downloadable from the database or indirectly obtained through Google Scholar in any language, were considered as inclusion criteria. Also, simple descriptive, comparative and correlational studies and the age range of participants from 6 to 12 years old, in accordance with the definition of a child according to PubMed’s MeSH terms.
Data on blood glucose, blood pressure, lipid profile indicators (Total Cholesterol, cHDL and triglycerides) and anthropometric measurements such as abdominal circumference and BMI were included.
Original articles in pre-print version, literature reviews and systematic reviews were excluded. Studies that considered hospitalized children with renal, hepatic and nervous system disorders were also excluded.
Study Selection and Data Extraction
The first stage of the selection of studies consisted of applying the inclusion criteria in the databases. The identified records were downloaded in “ris” extension files, which were exported to the Rayyan Platform (https://www.rayyan.ai/). In a second stage, two independent reviewers thoroughly evaluated the studies with reference to the type of study, the participants considered in them, and the results obtained in the research, to finally choose the research articles for the final discussion. Figure 1 shows the flowchart according to the PRISMA format:12
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Figure 1 Flowchart of the process of identification and selection of literature. |
The Rayyan platform was used to facilitate the work of the reviewers in terms of exporting the articles identified from the databases, eliminating duplicate information, and identifying the reasons for the exclusion of articles. From the database, 18 studies were obtained to be included, but six additional studies were added using the Google Scholar search engine and two studies obtained from other systematic reviews, which were not initially identified in the databases considered in this review.
Synthesis and Analysis of Data
The analysis of the research was carried out through a thorough review of the methodology and the results found in each analyzed article. The selected articles are presented in a summary table, which describes: author, year, country, sample size, and criteria used for the identification of MetS.
Descriptive statistical measures of central tendency and dispersion were used to determine the prevalence of MetS in general from the included articles, based on age and sex. The data were represented taking into account the average, standard deviation, and percentages.
A meta-analysis was not possible because the studies were not sufficiently homogeneous in terms of methodology, and there was a different distribution for quantitative data in reference to risk parameters.
Ethical Considerations
The principles outlined in the code of ethics of the César Vallejo University (UCV) were considered, that is, not appropriating the ideas of other authors, not creating information and other unethical aspects that denigrate research such as plagiarism. Likewise, this work has previously been approved by the Ethics Committee of the Professional School of Nutrition at UCV with the code PI-CEI-NUTRICIÓN-2023-006.
Results
In Table 3, the 26 selected studies are shown in which various criteria were used for the diagnosis of MetS in children under 13 years of age since 2015. In the case of the most well-known criteria such as NCEP ATP III, its application was found in seven studies13–19 representing 26.92%; while in relation to IDF criteria, they were identified in nine articles17–25 equivalent to 34.61% of the included studies. However, since 2015 there has been an increase in the use of more specific criteria for children, such as Cook et al ‘s criteria, the most used by researchers in this review present in 11 studies18,19,23–31 representing 42.31%; and de Ferranti’s criteria in six investigations18,19,24,25,32,33 representing 23.08%.
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Table 3 Diagnostic Criteria for Metabolic Syndrome in Children |
50% of the included studies were conducted in Latin American countries such as Brazil,13,24,31,32,35 Colombia,17,33 Chile26,27 and Mexico;18,21,28,30 the remaining included studies were located in Asia in countries like Iran,14,19,29 United Arab Emirates,15 China,16,23 Japan,20 Kuwait34 and India37 and finally in Europe; Italy,36,38 Poland22 and Turkey.25
There is also the appearance of new diagnostic criteria for MetS in children such as the study by Shi et al;34 who evaluated MetS through a proposal of composite and continuous MetS scores to represent a general measure of MetS in a large cohort of metabolically at-risk children focusing on the use of clinical parameters such as waist circumference (WC) and systolic blood pressure (SBP), complemented with two salivary variables glucose and HDL; and where each risk component had the same weighting in the final score. Barbalho et al35 using Agudelo and Arias’ criteria39 where MetS was considered if three or more were present: triglycerides≥110mg/dL; cHDL<40 mg/dL; fasting glucose ≥100mg/dL; blood pressure ≥90th percentile by age gender and weight and WC ≥90th percentile.
Leone et al36 and Vissuzo et al37 using Ahrens’ criteria40 based on the study of identification and prevention of diet- and lifestyle-induced health effects in children and infants (IDEFICs) with at least three of the following risk parameters: WC ≥90th percentile; SBP or DBP ≥90th percentile by sex and age; TGs≥90th percentile or cHDL≤10th percentile by sex and age; homeostatic model assessment for insulin resistance (HOMA-IR)≥90th percentile or fasting blood glucose (FBG) ≥90th percentile by sex and age. In Das et al’s study,37 Boney et al’s criterion41 was considered which defines the presence of MetS with two or more of the following criteria: obesity (BMI>85th percentile), hypertension (SBP or DBP>95th percentile by age), dyslipidemia (TGs >95th percentile or HDL <5th percentile by age), and glucose intolerance (FBG >110 mg/dl or 2 h postprandial glucose level >140 mg/dl after consuming a standard meal).
According to Table 4, the average anthropometric parameters for the children in the included studies are shown, where the average BMI was obtained from ten studies15,24–29,33,34,38 with results between 16 and 25.2 Kg/m2, while the average waist circumference was obtained from eight studies15,24–26,28,29,34,38 with values between 56.4 and 86.1 cm. Likewise, diastolic and systolic blood pressure are within normal values and below 80 and 120 mmHg respectively. In the case of glucose concentration, the average is less than 100 mg/dL.15,24,25,27,29,33,38 The triglyceride concentration can be considered <110 mg/dL15,24–29,33,38 and in relation to cHDL this is higher than 40 mg/dL.15,24–28,33,38 The average total cholesterol is below 180 mg/dL15,24,25,27,28,33,38 and also within normal values.
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Table 4 Overall Averages for Metabolic Syndrome Risk Factors in Children Within Included Studies |
Table 5 shows that in children with MetS, there is a high average prevalence of children with excess weight according to waist circumference ranging from 88.4 to 97%13,18,20,30 and a high average prevalence of obesity according to elevated BMI obtained from prevalences ranging from 27.8% to 100%.13,15,18,21,30,35 The most prevalent risk factors in children with MetS are elevated triglyceride concentration,13,18,20,21 low cHDL,13,18,20,21 elevated blood pressure13,18,20,21,30 and finally elevated fasting glucose as the least prevalent risk factor in MetS in children.13,18,20–22
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Table 5 Prevalence of Metabolic Syndrome Risk Factors in Children Diagnosed with Metabolic Syndrome in Included Studies |
Table 6 shows the prevalence of MetS in children, according to the different criteria used and based on age and sex. It has been found that the prevalence of MetS in girls is higher than the presence of this pathology in boys in seven studies15,20,28,29,31–33 while in four studies the prevalence of MetS is higher in boys than in girls.14,16,22,34
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Table 6 Prevalence of Metabolic Syndrome in Children, According to Diagnostic Criteria, Age, and Sex |
In terms of the prevalence of MetS, globally in the range of 6 to 12 years old, it varies between 0.83–45.9%, and varies depending on the criterion used, with the highest prevalence if the de Ferranti et al criterion is used as observed in two studies18,19 and with a lower prevalence value when using the Weiss et al and Viner et al criteria compared to other definitions of MetS determined in the research of Peña-Espinoza et al18 and Koohmanaee et al19 respectively.
Two studies were also found in which two different criteria were used for the diagnosis of MetS; in Serrano et al17 and Wang et al,23 a higher prevalence of MetS was observed with the Cook et al and NCEP-ATP III criteria compared to the IDF respectively. Likewise, there are four studies in which the application of three or more definitions for the evaluation of MetS was compared. In the studies by Guilherme et al24 and Beysel and Celik,25 a higher prevalence is observed when applying the Ferranti et al criteria compared to Cook et al and IDF. In the case of the research by Peña-Espinoza et al18 and Koohmanaee et al,19 where the percentage of MetS in children is higher with the de Ferranti criterion, secondly ATPIII and both stand out against the Cook and IDF criteria. Only in three studies do the prevalences of MetS determined by Cook et al criteria exceed that provided by IDF.19,23,25
Discussion
Diagnostic Criteria for MetS
The criteria for the diagnosis of MetS vary between studies, making it difficult to compare the prevalence of MetS in different populations of children. Likewise, this scoping review addressed the search for information and quantitative data for the identification criteria of MetS that include only children between 6 and less than 13 years old, unlike other reviews that do not separate them from adolescents, as is the case with the two systematic reviews by Bitew et al,42,43 in which more articles were found indicating a greater application with the Ferranti et al criteria.
The greater use of Cook’s criteria for the identification of MetS in children observed in this review differs from that carried out by Reisinger et al43 in which the IDF definition represented 45.28% of the selected studies, followed by Cook et al and de Ferranti et al with 28.30% and 15.09% respectively. Criteria with cut-off points in specific risk parameters for children can improve the accuracy of MetS diagnosis, this has allowed its usefulness in studies of MetS prevalence in children in the last decade, such as Cook et al’s criteria, and some that recently appear such as Ahrens et al.40 In this review, new ways of identifying MetS were found, the use of composite and continuous Z scores for MetS is an interesting proposal developed by Shi et al34 since biochemical parameters can be determined in saliva with values equivalent to those of plasma.
Average Values in Risk Parameters in Children
The average concentration of triglycerides and glycemia observed in Table 4 is below the threshold measures of 110 mg/dL and 100 mg/dL proposed by some definitions of MetS, so a criterion with these thresholds for TG and glycemia could be used, but also below more specific cut-off points for blood pressure and waist circumference according to age and gender in children.
The averages shown in Table 4, although they are within normal values, show a great variability, just as an example if we compare them with other studies not included, such as the case of Stavnsbo et al44 in Norwegian children, in them we can observe lower values of BMI, abdominal perimeter, and also in the concentration of triglycerides, the latter in approximately 61 mg/dL, and high levels of HDL in average 61.39 mg/dL among children of both sexes. This is due to the dietary habits of its inhabitants, which are mainly based on fish and have been associated with benefits against the components of MetS.45 The genetic aspect is also preponderant in the variability in the values of risk parameters and therefore in the prevalence of MetS in children.46 In this review, average values of risk parameters in children with MetS are not shown due to the scarce information available, but we do show average percentage data that will be discussed later.
Prevalence of Risk Factors in Children with MetS
This review also found that there is a very high prevalence of obesity in children with MetS, even in the study by Leone et al36 it reached 100%. Abdominal obesity, regardless of other fat deposits, is an important risk factor for systemic inflammation, hyperlipidemia, insulin resistance, and cardiovascular disease. Visceral fat deposits in abdominal obesity are associated with the development of enlarged and dysfunctional adipose cells. Dysfunctional adipose tissue secretes proinflammatory biomarkers including prostaglandins, C-reactive protein (CRP), and cytokines such as interleukins (for example, interleukin-6), tumor necrosis factor alpha (TNF-α), and leptin.47 Likewise, there is infiltration of macrophages into visceral adipose tissue that produces insulin resistance and leads to a shift in balance towards increased lipolysis and decreased lipogenesis. Therefore, the liver is faced with an increase in free fatty acid flow and this similarly leads to increased triglyceride synthesis and hyperlipidemia. Such intracellular accumulation makes cells vulnerable to the molecular effects of fatty acid derivatives that can interfere with the normal insulin signaling transduction pathway.48
However, the global prevalence of obesity in children has increased in recent years, which is also reflected in the rate of non-alcoholic fatty liver disease (NAFLD), a condition that also has a strong relationship with insulin resistance (IR) and MetS. Therefore, obesity should not be considered as mainly specific to adulthood, and thus it is important to identify it in childhood due to its relationship with the probable origin of the mentioned pathologies.49
An interesting point is the high prevalence of elevated triglyceride levels and low HDL-c, mainly in the studies by Rosini et al,13 Guzman-Guzman et al,21 and Peña-Espinoza et al18 and in Latin American countries such as Mexico and Brazil. However, low prevalences for these risk parameters can also be found in children with MetS, as is the case in the study by Matsushita et al.20 This has also allowed studies to be carried out based on the TG/HDL-c ratio as a useful marker in the diagnosis of MetS in children with obesity, as is the case of the CASPIAN-V study, in which it was observed in children aged 7 to 10 years that this indicator is a good predictor of MetS with a specificity and sensitivity slightly above 0.80.50
However, additional information is needed on other factors that predispose to this problem in relation to children’s diet and family history of hypercholesterolemia, as it has been observed that lipid disorders can vary in different ethnic groups.51 In addition to risk factors, it is necessary to consider predictors of MetS in children that would help identify it early, including adipose tissue cytokines such as adiponectin and irisin, an adipomyokine secreted by muscle in response to exercise, both of which were found to be well correlated with MetS in Gonzalez-Gil et al’s study.30 The presence of acanthosis nigricans, closely related to IR, would also be useful in predicting MetS in childhood, as it has a strong association with MetS especially in overweight and obese children, although this would be more useful in populations of Hispanic American children.37,52
Prevalence of MetS in Children
In this review, a higher prevalence of MetS was found in girls than in boys, differing from that reported in the systematic review by Friend et al53 with data from 2003 to 2010 and by Obita et al54 who used information from 2010 to 2018; however, both include children and adolescents aged 2 to 18 years. However, these prevalences of MetS between boys and girls can vary due to the variable prevalence of obesity present in different countries.55
The higher prevalence of MetS in children observed in de Ferranti et al compared to NCEP-ATP III, Cook et al, and IDF in that order has also been observed in a study by Valdes-Villalpando et al56 in a larger group of children and adolescents aged 6 to 16 years. In a review by Reisinger et al,57 it has also been observed that the prevalence by de Ferranti et al’s criteria and Cook et al’s are higher than IDF’s in both children and adolescents in some selected countries from America, Europe, Asia, and Africa, with information selected between 2013 and 2018. The discrepancies are attributable to the different cut-off values for each of the MetS components, which is why, when establishing strict thresholds, these can increase the number of diagnoses and therefore the prevalence and in the case of wider limits for cardiovascular risk, diagnoses are probably more reduced as is the prevalence of MetS. For example, in the case of de Ferranti et al criteria with stricter limits for WC (>75th percentile), HDL (<50 mg/dl), and TG (≥100 mg/dl), there is a greater probability that these thresholds will be exceeded in the analysis. This explains why the prevalence values by de Ferranti et al’s definition are higher than other classifications.
According to what was observed, it is difficult to establish criteria to unify, however if the average value of each risk parameter characterized in the included studies is considered, these are close to the thresholds established in the criteria of Cook et al, in addition to considering at least 3 risk factors without considering obesity as the main one, being in this way more specific. However, with respect to the criteria of Cook et al, their modification could be considered in the glucose concentration at the threshold of 100 mg/dL, the same one that IDF considers, and that as observed in Table 4, the average of general glycemia in the children participating in the included studies that characterized it does not reach that threshold. In this way, more studies would be needed, with a larger number of participants and from all continents in relation to this review to confirm what was mentioned.
To adjust the WC values according to the level of development and ethnic origin of the children, percentiles are usually used instead of absolute measures. Children with WC in the 90th percentile have a higher risk of having several factors associated with MetS than those who have a percentile lower than that level.6 In this aspect both Cook et al and IDF agree, and in which we consider these thresholds relevant from a preventive point of view.
Likewise, to detect MetS in blood pressure, the 90th percentile should be applied based on gender, age and height, using as a resource the blood pressure charts of the Fourth Report on the Diagnosis, Evaluation, and Treatment of High Blood Pressure in Children and Adolescents.58 The reason for this is that from 5 years old until puberty begins, SBP rises by 1–2 mmHg each year and DBP by 0.5–1 mmHg each year, with little differences between boys and girls. These changes are related to body growth and development, so normal values should consider, in addition to sex and age, body size.59 However, it is necessary that each country and region establishes and uses its own percentiles both in WC and blood pressure so that the identification of MetS is more specific in its population of children.
During the review we found very interesting the definition of Agudelo and Arías39 found in a study and that establishes the commented thresholds, except that these authors differ in the criterion of blood pressure in which they consider as threshold the 95th percentile; however, the identification of MetS cases could be reduced at that level.
Among the limitations of this scoping review are cross-sectional studies, not considering probable confounding variables that may have been present at the time of evaluating children. Also, the diversity of criteria for the diagnosis of MetS used in children makes its unification complex; however, it is important to know them and how to use them according to the characteristics of the children where the research is carried out and according to appropriate techniques and/or methods for evaluating biochemical and/or anthropometric parameters that allow the identification of MetS.
Conclusion
Although IDF and NCEP-ATP III are the most widely used criteria for the diagnosis of MetS in children from previous research to those considered in this review, there is a greater trend towards the use of more specific criteria such as Cook et al in order to improve the accuracy of MetS diagnosis in relation to cut-off thresholds for each risk parameter. The average values for each risk parameter in the children participating in the included studies are within normal values when compared with closer and established thresholds in the criteria of Cook et al. The risk factors with the highest prevalence in children with MetS are WC and BMI, followed by triglycerides, HDL, blood pressure and glycemia. The prevalence of MetS in children differs with the criteria applied for its identification, being higher with the criteria of De Ferranti, and more studies have been found in which MetS is more prevalent in girls than in boys.
Acknowledgments
We thank the Vice-Rectorate of Research of the César Vallejo University for their support and funding for this review.
Disclosure
The authors report no conflicts of interest in this work.
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