1. Division of Endoscopy and Ultrasonography, Department of Clinical Pathology and Laboratory Medicine, Kawasaki Medical School, Japan
2. Department of Health Care Medicine, Kawasaki Medical School, Japan
3. Department of Internal Medicine, Sakaide City Hospital, Japan
4. Junpukai Long Life Hospital, Japan
5. Division of Gastroenterology, Department of Internal Medicine 2, Kawasaki Medical School, Japan