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