Author contribution
RECRUITMENT
Yongkui Lu conceived this study. Aihua Tan designed the study. Hongxue Wang, Li Nong, Yuxian Jia, Wuning Zhong, Fanghui Qin, Han Wang, Jing Tang were responsible for subject recruitment and data collection. Li Nong performed statistical analysis. Yan Liu oversaw the statistical analysis. Aihua Tan wrote the paper. Yongkui Lu and Yan Liu contributed to data interpretation and critical revision. All authors reviewed the final version of the manuscript.