1. Division of Gastroenterology and Hepatology Department of Internal Medicine St. Marianna University School of Medicine Kanagawa Japan
2. Department of Internal Medicine Kawasaki Rinko General Hospital Kanagawa Japan
3. Division of GastroenterologyDepartment of Internal MedicineNippon Medical School Tokyo Japan
4. Department of Bioinformatics St. Marianna University Graduate School of Medicine Kanagawa Japan
5. Tada Tomohiro Institute of Gastroenterology and Proctology Saitama Japan