1. Department of Urology; Tohoku University School of Medicine; Sendai Japan
2. Department of Urology; Hara Sanshin Hospital; Fukuoka Japan
3. Department of Urology; Kagawa University Faculty of Medicine; Kagawa Japan
4. Department of Urology; Hirosaki University School of Medicine; Hirosaki Japan
5. Department of Urology; Kyushu University School of Medicine; Fukuoka Japan