1. Department of Metabolism/Diabetes and Clinical Nutrition, Nagasaki University Hospital, Nagasaki 852-8501, Japan
2. Department of Internal Medicine, National Hospital Organization Saga National Hospital, Saga 849-8577, Japan
3. Department of Molecular Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8523, Japan
4. Department of Endocrinology and Metabolism, Nagasaki University Hospital, Nagasaki 852-8501, Japan
5. Department of Radiology, Nagasaki University Hospital, Nagasaki 852-8501, Japan
6. Center for Health and Community Medicine, Nagasaki University, Nagasaki 852-8521, Japan