About the Authors

Xinyu Zhang

Affiliation Department of Health Service Management, School of Public Health, Tianjin Medical University, Tianjin, China

Lin Zhao

Affiliation Department of Health Service Management, School of Public Health, Tianjin Medical University, Tianjin, China

Zhuang Cui

Affiliation Department of Epidemiology and Health Statistics, School of Public Health, Tianjin Medical University, Tianjin, China

Yaogang Wang

wangyg@tmu.edu.cn

Affiliation Department of Health Service Management, School 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: YGW. Performed the experiments: XYZ LZ. Analyzed the data: XYZ ZC YGW. Contributed reagents/materials/analysis tools: ZC YGW. Wrote the paper: XYZ LZ.