1. Department of Digestive Disease Center, International University of Health and Welfare Mita Hospital
2. Department of Hepato-Biliary-Pancreatic & Gastrointestinal Surgery, International University of Health and Welfare, School of Medicine
3. Department of Digestive Disease Center, International University of Health and Welfare Atami Hospital
4. Department of Diagnostic Pathology Center, International University of Health and Welfare Mita Hospital