1. Department of Endocrinology and Metabolism, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
2. The First Department of Internal Medicine, Wakayama Medical University, Wakayama 641-8509, Japan
3. Kurashiki Central Hospital, Kurashiki 710-8602, Japan
4. Medical Innovation Center, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
5. Laboratory of Nutrition Chemistry, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
6. Department of Biochemistry, National Cardiovascular Center Research Institute, Osaka 565-8565, Japan