1. Department of Urology; Hiroshima University School of Medicine; Hiroshima; Japan
2. Department of Neurology; Wonkwang University School of Medicine, Jeonbuk Regional Cardiocerebrovascular Disease Center, Institute of Wonkwang Medical Science; Iksan; Korea
3. Division of Proctology; Fumon-in Clinic; Mashiko town, Tochigi; Japan
4. Department of Anatomy; Sapporo Medical University School of Medicine; Sapporo; Japan
5. Division of Internal Medicine; Iwamizawa Kojin-kai Hospital; Iwamizawa; Japan