1. Faculty of Medical Science, Wonkwang University Graduate School, Iksan, Korea.
2. Department of Neurology, Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Korea.
3. Department of Urology, Hiroshima University School of Medicine, Hiroshima, Japan.
4. Department of Anatomy, Chonbuk National University Medical School, Jeonju, Korea.
5. Division of Internal Medicine, Iwamizawa Kojin-kai Hospital, Iwamizawa, Japan.
6. Department of Anatomy, Tokyo Dental College, Tokyo, Japan.