1. Department of Surgery, Japan Community Health Care Organization Sapporo Hokushin Hospital
2. Department of Gastroenterological Surgery 1, Hokkaido University Graduate School of Medicine
3. Department of Diagnostic Imaging, Hokkaido University Hospital
4. Department of Pathology, Japan Community Health Care Organization Sapporo Hokushin Hospital
5. Department of Gastroenterology, Japan Community Health Care Organization Sapporo Hokushin Hospital