1. Division of Gastroenterology; Department of Internal Medicine; Kobe University Graduate School of Medicine; Kobe Japan
2. Section of Evidence-based Laboratory Medicine; Division of Clinical Pathology and Immunology; Department of Internal Medicine; Kobe University Graduate School of Medicine; Kobe Japan
3. Department of Endoscopy; Kobe University Hospital; 7-5-1 Kusunoki-cho Chuo-ku Kobe 650-0017 Japan