1. Division of Gastrointestinal and Pediatric Surgery, Department of Surgery, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8503, Japan
2. Department of Vascular Surgery, Tottori Prefectural Kousei Hospital, Kurayoshi 682-0804, Japan and
3. Department of Gastroenterological Surgery, Tottori Prefectural Kousei Hospital, Kurayoshi 682-0804, Japan