1. Department of Anesthesiology and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University and the Research Units of West China, Chinese Academy of Medical Sciences, Chengdu 610041, China
2. Mental Health Center, West China Hospital, Sichuan University, Chengdu 610041, China
3. West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
4. Department of Medical Administration, West China Hospital, Sichuan University, Chengdu 610041, China
5. Department of Integrated Traditional and Western Medicine, West China Hospital, Sichuan University, Chengdu 610041, China
6. Department of Periodical Press and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China
7. Chinese Evidence-Based Medicine Center, West China Hospital, Sichuan University, Chengdu 610041, China
8. Nursing Key Laboratory of Sichuan Province, Chengdu 610041, China