1. Department of Hematology, Endocrinology & Metabolism Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
2. Department of Internal Medicine, Local Incorporated Administrative Agency, Tokushima Prefecture Naruto Hospital, Naruto 772-0001, Japan
3. Diabetes Therapeutics and Research Center, Tokushima University, Tokushima 770-8503, Japan
4. Fujii Memorial Institute of Medical Sciences, Tokushima University, Tokushima 770-8503, Japan