About the Authors

Zhichao Jin

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

Danghui Yu

Affiliation Academic Journal of Second Military Medical University, Shanghai, China

Luoman Zhang

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

Hong Meng

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

Jian Lu

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

Qingbin Gao

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

Yang Cao

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

Xiuqiang Ma

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

Cheng Wu

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

Qian He

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

Rui Wang

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 have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ZJ DY JH. Performed the experiments: ZJ LZ HM JL QG YC XM CW QH RW. Analyzed the data: ZJ. Contributed reagents/materials/analysis tools: JH. Wrote the paper: ZJ DY. Group discussion and data collection: LZ HM JL QG YC XM. Group discussion: CW QH RW.