1. Department of Urology, Tottori University School of Medicine, Yonago, Japan
2. Department of Urology, Kobe University Graduate School of Medicine, Kobe, Japan
3. Division of Internal Medicine, Iwamizawa Kojin-kai Hospital, Iwamizawa, Japan
4. Department of Anatomy, Tokyo Dental College, Tokyo, Japan
5. Maxillofacial Anatomy, Department of Maxillofacial Biology, Tokyo Medical and Dental University, Tokyo, Japan