Chang Xu1, Chao Zhang2, Joey S W Kwong3. 1. Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, China;; Center for Evidence-based Medicine and Clinical Research, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China. 2. Center for Evidence-based Medicine and Clinical Research, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China. 3. Chinese Evidence-Based Medicine Center and Chinese Cochrane Center, West China Hospital, Sichuan University, Chengdu 610041, China.