1. Department of Urology, Tianjin Institute of Urology, The Second Hospital of Tianjin Medical University, Tianjin, China.
2. Key Laboratory of Gansu Province for Urological Diseases, Gansu Nephro-Urological Clinical Center, Institute of Urology, Lanzhou University Second Hospital, Lanzhou, China.
3. Department of Urology, Peking University Shougang Hospital, Beijing, China.
4. Department of Urology, Capital Medical University, Beijing Xuanwu Hospital, Beijing, China.