1. Department of Gastroenterology and Oncology; Institute of Health Biosciences; The University of Tokushima Graduate School; Tokushima
2. Department of Gastroenterology; Kagawa Prefectural Cancer Detection Center; Takamatsu Japan
3. Department of Gastroenterology; Nijinohashi Clinic; Tokushima
4. Division of Pathology; Tokushima University Hospital; Tokushima