1. Division of Gastroenterology and Hepatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
2. Department of Gastroenterology, Cancer Institute Hospital, Tokyo, Japan
3. Department of Gastroenterology, International University of Health and Welfare Ichikawa Hospital, Ichikawa, Japan
4. Department of Gastroenterology, Kitasato University School of Medicine, Sagamihara, Japan
5. Department of Health and Nutrition, Nagoya Bunri University, Inazawa, Japan
6. Department of Molecular-Targeting Prevention, Kyoto Prefectural University of Medicine, Osaka, Japan