1) Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine, Yufu, Japan
2) Comprehensive Surgery for Community Medicine, Oita University Faculty of Medicine, Yufu, Japan
3) Postgraduate Clinical Training Center, Oita University Faculty of Medicine, Yufu, Japan
4) Department of Human Anatomy, Oita University Faculty of Medicine, Yufu, Japan

Hidefumi Shiroshita¹⁾, Takahide Kawasaki²⁾, Yohei Kono¹⁾, Takashi Masuda¹⁾, Teijiro Hirashita¹⁾, Tomonori Akagi¹⁾, Kosuke Suzuki¹⁾, Shigeo Ninomiya¹⁾, Yuichi Endo¹⁾, Tomotaka Shibata¹⁾, Yoshitake Ueda²⁾³⁾, Manabu Tojigamori¹⁾, Tsuyoshi Etoh¹⁾, Norio Shiraishi²⁾, Fumihiko Hamada⁴⁾, Masafumi Inomata¹⁾³⁾