1. Department of Obstetrics and Gynecology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
2. Department of Obstetrics & Gynecology, Tokushima Municipal Hospital, Tokushima 770-0812, Japan
3. Department of Urology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
4. Department of Renal and Genitourinary Surgery, Graduate School of Medicine, Hokkaido University, Sapporo 060-0808, Japan