1. Department of Urology, The Affiliated Hospital of Putian University, Putian, Fujian 351100, P.R. China
2. Department of Urology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330000, P.R. China
3. Department of Urology, Jiujiang No. 1 People's Hospital, Jiujiang, Jiangxi 332000, P.R. China
4. Department of Ultrasound, Clinical Medical College and The First Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan 610500, P.R. China
5. Department of Urology, Fujian Medical University Union Hospital, Fuzhou, Fujian 350000, P.R. China