1. Department of Molecular Pathology; Shinshu University Graduate School of Medicine; Matsumoto Japan
2. Department of Gastroenterology; Shinshu University School of Medicine; Matsumoto Japan
3. Department of Gastroenterology; Nagano Municipal Hospital; Nagano Japan
4. Department of Surgery; Shinshu University School of Medicine; Matsumoto Japan
5. Department of Internal Medicine; Nagano Prefectural Kiso Hospital; Kiso Japan
6. Department of Internal Medicine; Matsumoto City Hata General Hospital; Matsumoto Japan
7. Department of Gastroenterology; Suwa Red Cross Hospital; Suwa Japan
8. Department of Internal Medicine; Iiyama Red Cross Hospital; Iiyama Japan
9. Endoscopic Examination Center; Shinshu University Hospital; Matsumoto Japan