1 Research Department II, China Development Research Foundation, Beijing, China.
2 Harvard T.H. Chan School of Public Health, MA, United States.
3 Department of Epidemiology and Health Statistics, School of Public Health & Key Laboratory of Ministry of Education for Gastrointestinal Cancer, Fujian Medical University, Fuzhou, China.
4 Department of Health Policy and Management, School of Public Health, Peking University, Beijing, China.
5 Department of Global Health, School of Public Health, Peking University, Beijing, China.