1. Department of Urology, Key Laboratory of Disease of Urological Systems, Gansu Nephro-Urological Clinical Center, Lanzhou University Second Hospital, Lanzhou, China
2. College of Animal Science and Technology, Guangxi University, Nanning, China
3. Department of Paediatric, Lanzhou University Second Hospital, Lanzhou, China
4. Department of Urology, University Hospitals Case Medicine Center, Case Western Reserve University, Cleveland, OH, USA