1. Department of Health Policy and Management Jiangsu University Zhenjiang Jiangsu China
2. Department of Labor and Social Security, School of Public Health Southeast University Nanjing Jiangsu China
3. Department of Management Studies, Faculty of Integrated Management Science University of Mines and Technology Tarkwa Ghana
4. Hunan Provincial Key Laboratory of Clinical Epidemiology, Department of Epidemiology and Biostatistics, Xiangya School of Public Health Central South University Changsha Hunan China