1. Department of Gastrointestinal Surgery/Breast Surgery, Kanazawa University Graduate School of Medical Science , 13-1 Takaramachi, Kanazawa, Ishikawa 920-8641 , Japan
2. Department of General and Digestive Surgery, Kanazawa Medical University Hospital , 1-1 Digaku, Uchinadamachi, Ishikawa, Kahoku, Ishikawa 920-0293 , Japan
3. Department of Gastroenterology, Kanazawa University Graduate School of Medical Science , 13-1 Takaramachi, Kanazawa, Ishikawa 920-8641 , Japan