Bi-Ming He1,2, Ying-Hao Sun3, Hai-Feng Wang1,2. 1. Department of Urology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China. 2. Department of Urology, Shanghai Changhai Hospital, Second Military Medical University, Shanghai, China. 3. Department of Urology, Shanghai Changhai Hospital, Second Military Medical University, Shanghai, China. sunyhsmmu@126.com.