1. Department of Periodical Press and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
2. Chinese Evidence-Based Medicine Center, West China Hospital, Sichuan University, Chengdu, China
3. West China School of Medicine, Sichuan University, Chengdu, China
4. Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, China