1. Department of Urology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto
2. Department of Urology, Japanese Red Cross Wakayama Medical Center, Wakayama
3. Department of Urology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto
4. Department of Diagnostic Pathology, Kumamoto University Hospital, 1-1-1 Honjo, Chuo-ku, Kumamoto, Japan