1. Department of Advanced Blood Purification Therapy, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
2. Department of Urology, Akita University Graduate School of Medicine, Akita, Japan
3. Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
4. Department of Urology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
5. Department of Urology, National Cancer Center Hospital, Tokyo, Japan
6. Department of Urology, Faculty of Medicine, University of Toyama, Toyama, Japan