1. Department of Endocrinology and Diabetes Mellitus, Fukuoka University Chikushi Hospital, Chikushino, Fukuoka 818-8502, Japan
2. Division of Diabetic Medicine, Bunyukai Hara Hospital, Ohnojo, Fukuoka 816-0943, Japan
3. Department of Genome Medicine, National Research Institute for Child Health, Setagaya, Tokyo 157-8535, Japan
4. Department of Medicine, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan
5. Department of Laboratory Medicine, School of Medicine, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
6. Division of Endocrinology and Metabolism, Kurume University School of Medicine, Kurume, Fukuoka 830-0111, Japan
7. Diabetes Center, Seikokai Kusatsu General Hospital, Kusatsu, Shiga 525-8585, Japan