1. Department of Gastroenterology; Tama-Nagayama University Hospital; Nippon Medical School; Tokyo; Japan
2. Department of Gastroenterology; Osaka City University Graduate School of Medicine; Osaka; Japan
3. Department of Gastroenterological Surgery; Watanabe Hospital; Okayama; Japan
4. Department of Internal Medicine; Tokutomi Clinic; Yamaguchi; Japan
5. Department of Gastroenterology and Hepatology; Graduate School of Medical Sciences; Kumamoto University; Kumamoto; Japan
6. Digestive and Cardiovascular Medicine; University of Tokushima School of Medicine; Tokushima; Japan
7. Department of Internal Medicine; Machida Gastrointestinal Hospital; Osaka; Japan
8. Division of Gastroenterology; Department of Internal Medicine; Okayama; Japan
9. Department of Surgery; Sugiyama Clinic; Nagano; Japan
10. Department of Internal Medicine; Center for Gastroenterology and Endoscopy; Kawasaki Hospital; Kawasaki Medical School; Okayama; Japan
11. Department of Internal Medicine; Maruko Central General Hospital; Nagano; Japan
12. Department of Gastroenterology; Hiroshima University; Hiroshima
13. Department of Gastroenterology; Kagawa Prefectural Cancer Detection Center; Kagawa; Japan
14. Biomedical Laboratory Sciences; School of Health Sciences, School of Medicine, Shinshu University; Nagano; Japan