About the Authors

Yu-Hao Zhou

Contributed equally to this work with: Yu-Hao Zhou, Xin Wei

Affiliation Department of Health Statistics, Second Military Medical University, Shanghai, China

Xin Wei

Contributed equally to this work with: Yu-Hao Zhou, Xin Wei

Affiliation School of Medicine, Shanghai Jiao Tong University, Shanghai, China

Jian Lu

Affiliation Department of Health Statistics, Second Military Medical University, Shanghai, China

Xiao-Fei Ye

Affiliation Department of Health Statistics, Second Military Medical University, Shanghai, China

Mei-Jing Wu

Affiliation Department of Health Statistics, Second Military Medical University, Shanghai, China

Jin-Fang Xu

Affiliation Department of Health Statistics, Second Military Medical University, Shanghai, China

Ying-Yi Qin

Affiliation Department of Health Statistics, Second Military Medical University, Shanghai, China

Jia He

hejia63@yahoo.com

Affiliation Department of Health Statistics, Second Military Medical University, Shanghai, China

Competing Interests

The authors declare that they have no conflicts of interest.

Author Contributions

Conceived and designed the experiments: YZ JH. Performed the experiments: YZ. Analyzed the data: XY YQ JX. Contributed reagents/materials/analysis tools: JL JH. Wrote the paper: YZ. Contributed to the electronic search and hand-search of the literature: XW. Contributed to the revision of the manuscript: MW.