1. West China Hospital, Sichuan University; Department of Dermatology & Venereology; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
2. West China Hospital, Sichuan University; Center of Geriatrics and Gerontology; No. 37, Guo Xue Lane Chengdu Sichuan China 610041
3. West China Hospital, Sichuan University; Chinese Cochrane Centre, Chinese Evidence-Based Medicine Centre; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041