1. Department of Urology, Chinese People's Liberation Army, 89th Hospital, Weifang, Shandong 261000, P.R. China
2. Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
3. Department of Urology, State Key Laboratory of Kidney Diseases, Chinese People's Liberation Army General Hospital, PLA Medical School, Beijing 100853, P.R. China