1. Department of Medical Science, Graduate School of Medicine, Hiroshima University, Hiroshima 734-8551, Japan
2. Department of Pharmacotherapy, Meiji Pharmaceutical University, 2-522-1, Kiyose 204-8588, Japan
3. Division of Diabetes and Metabolic Diseases, Nihon University School of Medicine, Tokyo 173-8610, Japan
4. Division of Neurology, Respirology, Endocrinology and Metabolism, Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
5. Department of Clinical Cell Biology, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan
6. Department of Anatomical Pathology, Hiroshima University Hospital, Hiroshima 734-8551, Japan