1. Department of Epidemiology and Biostatistics School of Health Sciences Wuhan University Wuhan Hubei 430071 P. R. China
2. Department of Information Management School of Public Health and Management Hubei University of Medicine Shiyan Hubei 442000 P. R. China
3. Department of Research The First Affiliated Hospital of Anhui Medical University Hefei Anhui 230022 P. R. China
4. Global Health Institute Wuhan University Wuhan Hubei 430072 P. R. ChinaThis