About the Authors

Yanqi Zhang

Affiliation Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China

Liang Zhou

Affiliation Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China

Xiaoyu Liu

Affiliation Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China

Ling Liu

Affiliation Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China

Yazhou Wu

Affiliation Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China

Zengwei Zhao

Affiliation Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China

Dali Yi

Affiliation Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China

Dong Yi

yd_house@hotmail.com

Affiliation Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YZ LZ Dong Y. Performed the experiments: XL LL. Analyzed the data: YW LZ. Contributed reagents/materials/analysis tools: YZ ZZ Dali Y. Wrote the paper: YZ LZ Dong Y.