About the Authors

Wenhua Yu

Contributed equally to this work with: Wenhua Yu, Changping Li, Xiaomeng Fu

Affiliation Department of Health Statistics, College of Public Health, Tianjin Medical University, Tianjin, China

Changping Li

Contributed equally to this work with: Wenhua Yu, Changping Li, Xiaomeng Fu

Affiliation Department of Health Statistics, College of Public Health, Tianjin Medical University, Tianjin, China

Xiaomeng Fu

Contributed equally to this work with: Wenhua Yu, Changping Li, Xiaomeng Fu

Affiliation Department of Health Statistics, College of Public Health, Tianjin Medical University, Tianjin, China

Zhuang Cui

Affiliation Department of Health Statistics, College of Public Health, Tianjin Medical University, Tianjin, China

Xiaoqian Liu

Affiliation Department of Health Statistics, College of Public Health, Tianjin Medical University, Tianjin, China

Linlin Fan

Affiliation Department of Health Statistics, College of Public Health, Tianjin Medical University, Tianjin, China

Guan Zhang

Affiliation Department of Health Statistics, College of Public Health, Tianjin Medical University, Tianjin, China

Jun Ma

junma@tijmu.edu.cn

Affiliation Department of Health Statistics, College of Public Health, Tianjin Medical University, Tianjin, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WY CL. Analyzed the data: WY CL. Wrote the paper: WY CL XF. Designed and revised the figures and tables in the manuscript: XL GZ. Data collection of this study: XF LF. Provided full discussion and revision: ZC JM.