1. Department of Urology; Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama Japan
2. Okayama Urological Research Group; Okayama Japan
3. Department of Urology; Okayama Rosai Hospital; Okayama Japan
4. Department of Urology; Okayama City General Medical Center; Okayama Japan
5. Department of Urology; Japanese Red Cross Okayama Hospital; Okayama Japan