1. Department of Metabolism/Diabetes and Clinical Nutrition, Nagasaki University Hospital, Nagasaki, Japan
2. First Department of Internal Medicine, Graduate School of Biomedical Science, Nagasaki University, Nagasaki, Japan
3. Center for Health and Community Medicine, Nagasaki University, Nagasaki, Japan
4. Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Fukuoka, Japan