Government of the People's Republic of China - Chinese PLA General Hospital, National University of Singapore (NUS) - Department of Sociology and Anthropology, Renmin University of China - School of Labor and Human Resources, China Population and Development Research Center, Peking University - China Center for Health Development Studies, National University of Singapore (NUS), Beijing Jiaotong University - School of Economics and Management, Peking University - Center for Healthy Aging and Development Studies, Government of the People's Republic of China - Chinese PLA General Hospital, Soochow University, Peking University - Center for Healthy Aging and Development Studies, affiliation not provided to SSRN, Government of the People's Republic of China - Department of Cardiology, Zhejiang University, Zhejiang University, China Population and Development Research Center, Government of the People's Republic of China - Chinese PLA General Hospital, Government of the People's Republic of China - Chinese PLA General Hospital, Duke University - Center for the Study of Aging and Human Development and China Population and Development Research Center