1. Department of Medicine; Teikyo University School of Medicine; 2-11-1 Kaga, Itabashi-ku Tokyo 173-8605 Japan
2. Department of General Medicine; Hiroshima University; Graduate School of Medical Science; Programs of Applied Medicine; Clinical Pharmacotherapy; Hiroshima Japan
3. Department of Gastroenterology; Japanese Red Cross Nagoya Daini Hospital; Nagoya Japan
4. Department of Gastroenterology; Graduate School of Medicine; The University of Tokyo; Tokyo Japan
5. Department of Medicine and Clinical Oncology; Graduate School of Medicine; Chiba University; Chiba Japan
6. Department of Internal Medicine; Second Teaching Hospital; Fujita Health University; Nagoya Japan