1. Department of Gastroenterology and Hepatology; Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama Japan
2. Hakushusanbi Endoscopic Workshop Group; Japan
3. Department of General Internal Medicine 2; Kawasaki Medical School; Okayama Japan
4. Department of Gastroenterology; Tottori University Hospital; Yonago Japan
5. Division of Clinical study of Oncology; Shimane University School of Medicine; Izumo Japan
6. Department of Gastroenterology and Neurology; Kagawa University; Kagawa Japan
7. Department of Gastroenterology and Hepatology; Tottori Municipal Hospital; Tottori Japan
8. Department of Internal Medicine II; Shimane University School of Medicine; Izumo Japan