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Paper published by Dr Zhiwen Zheng:
Original Research
Vitamin D deficiency is associated with the severity of COPD: a systematic review and meta-analysis
Zhu BY, Zhu BQ, Xiao CL, Zheng ZW
International Journal of Chronic Obstructive Pulmonary Disease 2015, 10:1907-1916
Published Date: 11 September 2015