1. Department of Surgery and Research Institute of Clinical Medicine; Chonbuk National University Medical School; Jeonju; Korea
2. Department of Anatomy; Chonbuk National University Medical School; Jeonju; Korea
3. Department of Anatomy and Embryology II; Faculty of Medicine; Complutense University; Madrid; Spain
4. Division of Internal Medicine; Iwamizawa Kojin-kai Hospital; Iwamizawa; Japan