1. West China Hospital, Sichuan University; Department of Geriatrics; 37 Guo Xue Xiang Street Chengdu Sichuan China 610041
2. Affiliated Hospital, Medical College of Yanan University; Department of Cardiovascular Medicine; No.43, North Avenue, BaoTa District. Yanan Shaanxi China 716000
3. Affiliated Hospital, Medical College of Yanan University; Department of Pathology; No. 43, North Avenue, BaoTa District Yanan Shaanxi China 716000
4. West China Hospital, Sichuan University; Department of Gerontology; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
5. West China Hospital, Sichuan University; Chinese Clinical Trial Registry, Chinese Ethics Committee of Registering Clinical Trials; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
6. West China Hospital, Sichuan University; Chinese Cochrane Centre, Chinese Evidence-Based Medicine Centre; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041