Institution: | 1.Department of Geriatrics, West China Hospital, Sichuan University, Chengdu 610041;2.National Clinical Research Center of Geriatrics, West China Hospital, Sichuan University, Chengdu 610041;3.Health Care and Medical Research Center, Sichuan University, Chengdu 610041;4.Department of Senior Ward, China-Japan Friendship Hospital, Beijing 100029, China |