1. Department of General and Digestive Surgery, Kanazawa Medical University Hospital, Kahoku, Ishikawa 920‑0293, Japan
2. Department of Gastroenterological Surgery, Ishikawa Prefectural Central Hospital, Kanazawa, Ishikawa 920‑8530, Japan
3. Department of Surgery, Houju Memorial Hospital, Nomi, Ishikawa 923‑1226, Japan
4. Department of Gastroenterology, Kanazawa University, Kanazawa, Ishikawa 920‑8641, Japan
5. Department of Surgery, Toyama Nishi General Hospital, Toyama, Toyama 939‑2716, Japan
6. Department of Gastrointestinal Surgery, Kanazawa University, Kanazawa, Ishikawa 920‑8641, Japan
7. Department of Surgery, Fukui Prefectural Hospital, Fukui, Fukui 910‑0846, Japan