1. Department of Gastrointestinal Oncology; Osaka Medical Center for Cancer and Cardiovascular Disease; Osaka Japan
2. Department of Gastroenterology and Hepatology; Osaka University Graduate School of Medicine; Osaka Japan
3. Department of Endoscopic Training and Learning Center; Osaka Medical Center for Cancer and Cardiovascular Disease; Osaka Japan
4. Department of Surgery; Osaka Medical Center for Cancer and Cardiovascular Disease
5. Department of Surgery and Clinical Oncology; Osaka University Graduate School of Medicine; Osaka Japan