1. Division of Gastrointestinal and General Surgery, St. Marianna University School of Medicine
2. Division of Gastroenterogical and General Surgery, St. Marianna University School of Medicine, Yokohama City Seibu Hospital
3. Division of Gastrointestinal and General Surgery, Kawasaki Municipal Tama Hospital
4. Division of Pathology, St. Marianna University School of Medicine
5. Digestive Disease Center, St. Marianna University School of Medicine, Toyoko Hospital