1. Division of Gastroenterology Department of Internal Medicine Iwate Medical University Morioka Japan
2. Department of Endoscopic Diagnostics and Therapeutics Saga University Hospital Saga Japan
3. Department of Medicine and Clinical Science Graduate School of Medical Sciences Kyushu University Fukuoka Japan
4. Division of Gastroenterology Matsuyama Red Cross Hospital Matsuyama Japan
5. Department of Diagnostic Pathology Iwate Medical University Morioka Japan
6. Department of Anatomic Pathology Graduate School of Medical Sciences Kyushu University Fukuoka Japan
7. Department of Pathology Matsuyama Red Cross Hospital Matsuyama Japan