1. Division of Gastroenterology, Department of Internal Medicine, Iwate Medical University, Morioka, Japan
2. Division of Molecular Diagnostic Pathology, Department of Pathology, Iwate Medical University, Morioka, Japan
3. Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
4. Department of Endoscopic Diagnostic and Therapeutics, Saga University, Saga, Japan
5. Department of Gastroenterology and Hepatology, Shimane University School of Medicine, Izumo, Japan