1. Department of Urology, Minda Hospital Affiliated to Hubei Institute for Nationalities, Enshi, Hubei 445000, P.R. China
2. Department of Urology, Wuhan Central Hospital, Wuhan, Hubei 430014, P.R. China
3. Department of Urology, The First Affiliated Hospital of University of South of China, Hengyang, Hunan 421001, P.R. China
4. Department of Urology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China