1. Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan;
2. Department of Gastroenterology, Hyogo Prefectural Nishinomiya Hospital, Nishinomiya, Hyogo, Japan;
3. Department of Gastroenterology, Daini Osaka Police Hospital, Osaka, Osaka, Japan;
4. Department of Gastroenterology, Nishinomiya Municipal Central Hospital, Nishinomiya, Hyogo, Japan;
5. Department of Gastroenterology, Saiseikai Senri Hospital, Suita, Osaka, Japan;
6. Department of Gastroenterology, Osaka Rosai Hospital, Sakai, Osaka, Japan;
7. Department of Gastroenterology, Toyonaka Municipal Hospital, Toyonaka, Osaka, Japan;
8. Department of Gastroenterology, Japan Community Health Care Organization Osaka Hospital, Osaka, Osaka, Japan;
9. Department of Gastroenterology, Otemae Hospital, Osaka, Osaka, Japan;
10. Department of Gastroenterology, Itami City Hospital, Itami, Hyogo, Japan;
11. Department of Gastroenterology, Kansai Rosai Hospital, Amagasaki, Hyogo, Japan;
12. Department of Internal Medicine, Osaka Police Hospital, Osaka, Osaka, Japan;
13. Department of Gastrointestinal Oncology, Osaka International Cancer Institute, Osaka, Osaka, Japan;
14. Department of Pathology, Osaka International Cancer Institute, Osaka, Osaka, Japan;
15. Department of Pathology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.