Affiliation: | 1. Department of Geriatrics and National Clinical Research Center for Geriatrics, West China Hospital of Sichuan University, Chengdu, Sichuan, China;2. Department of Gastroenterology, Jiangyou 903 Hospital, Mianyang, Sichuan, China;3. Department of Palliative Medicine, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan Province, China |