1. Gastroenterology Center, Ehime Prefectural Central Hospital, Japan
2. Department of Internal Medicine, Saiseikai Imabari Dai2 Hospital, Japan
3. First Department of Pathology, Sapporo Medical University, Japan
4. Research Integrity Office, Fujita Health University, Japan
5. Department of Gastroenterology and Metabology, Ehime University Graduate School of Medicine, Japan