1. Center for Evidence-Based and Translational Medicine; Zhongnan Hospital; Wuhan University; Wuhan China
2. Center for Evidence-based Medicine and Clinical Research; Taihe Hospital; Hubei University of Medicine; Shiyan China
3. Chinese Cochrane Centre; West China Hospital; Sichuan University; Chengdu China
4. Department of Epidemiology and Biostatistics; School of Public Health; Peking University Health Science Centre; Beijing China