1. Department of Periodical Press and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041 Sichuan, China
2. Department of Clinical Medicine, Gansu University of Traditional Chinese Medicine, Lanzhou 730020, China
3. The Center of Gerontology and Geriatrics, West China Hospital, West China School of Medicine, Sichuan University, Chengdu, China
4. West China School of Medicine, Sichuan University, Chengdu 610041, China
5. Department of Endocrinology and Metabolism, West China Hospital, Sichuan University, Chengdu 610041, China
6. Chinese Evidence-Based Medicine Center, West China Hospital, Sichuan University, Chengdu 610041, China