1. From the Department of Geriatrics, West China Hospital, Si Chuan University, Chengdu, Si Chuan, P.R. China; Department of Community and Family Medicine (J.T., J.W.), School of Public Health, Chinese University of Hong Kong; Centre of Epidemiology and Biostatistics (J.L.), School of Public Health, Chinese University of Hong Kong; Institute of Chinese Medicine (P.-C.L.), Chinese University of Hong Kong; Chinese Cochrane Center (Y.L.), West China Hospital, Sichuan University.