1. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Japan
2. Department of Gastroenterology, Kyushu Rosai Hospital, Japan
3. Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Japan
4. Digestive Diseases Branch, National Institutes of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, USA
5. Department of Molecular Endocrinology and Metabolism, Graduate School of Medicine Tokyo Medical and Dental University, Japan