1. Medical Education Center, Aichi Medical University School of Medicine, Aichi, Japan.
2. Department of Anatomy, Aichi Medical University School of Medicine, Aichi, Japan.
3. Department of Anatomy, Chonbuk National University Medical School, Jeonju, Korea.
4. Department of Anatomy and Embryology II, Complutense University School of Medicine, Madrid, Spain.
5. Division of Internal Medicine, Iwamizawa Kojin-kai Hospital, Hokkaido, Japan.