1. Department of Urology Tsukuba University Hospital Ibaraki Japan
2. Department of Urology, School of Medicine Faculty of Medicine, Toho University Ohashi Medical Center Tokyo Japan
3. Department of Renal and Urological Surgery, School of Medicine Faculty of Medicine, International University of Health and Welfare Chiba Japan
4. Department of Urology and Andrology, Majors of Medical Sciences Graduate School of Comprehensive Human Sciences, University of Tsukuba Ibaraki Japan
5. Departments of Obstetrics and Gynecology Faculty of Medicine, University of Tsukuba Ibaraki Japan