1. Department of Gastroenterology, Hiroshima University
2. Department of Gastroenterology, Hiroshima City North Medical Center Asa Citizens Hospital
3. Department of Gastroenterology, National Organization Kure Medical Center and Chugoku Cancer Center
4. Department of Gastrointestinal Endoscopy and Medicine, Hiroshima University
5. Department of Health Sciences, Hiroshima Cosmopolitan University