1. Department of Internal Medicine, Mitsugi General Hospital, Japan
2. Division of Gastroenterology, Department of Internal Medicine, Kawasaki Medical School, Japan
3. Departments of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Japan
4. Department of Pathology, Hakujyuji Hospital, Japan
5. Division of Endoscopy and Ultrasonography, Department of Clinical Pathology and Laboratory Medicine, Kawasaki Medical School, Japan