1. Department of Molecular and Internal Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
2. Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
3. Division of Diabetes and Metabolism, The Institute for Adult Diseases, Asahi Life Foundation, Tokyo, Japan
4. Division of Diabetes and Metabolic Diseases, Nihon University School of Medicine, Tokyo, Japan
5. Department of Internal Medicine, Division of Neurology, Respirology, Endocrinology and Metabolism, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
6. Department of Clinical Cell Biology, Graduate School of Medicine, Chiba University, Chiba, Japan