1. Center for Health Policy Research and Evaluation, Renmin University of China, Beijing 100872, China
2. School of Public Administration and Policy, Renmin University of China, Beijing 100872, China
3. Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Centre, Beijing 100191, China
4. Institute for Global Health and Development, Peking University, Beijing 100871, China
5. Department of Global Health and Population, Harvard TH Chan School of Public Health, Boston, MA 02115, USA