1. Division of Endoscopy and Ultrasonography, Department of Clinical Pathology and Laboratory Medicine, Kawasaki Medical School, Kurashiki, Japan
2. Department of Rehabilitation Medicine, Kawasaki Medical School, Kurashiki, Japan
3. Department of General Medicine, Kawasaki Medical School, Kurashiki, Japan
4. Department of General Internal Medicine 2, Kawasaki Medical School, Kurashiki, Japan