1. Department of Patho-physiology/Periodontal Science, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
2. Division of Diabetes, Kansai-Denryoku Hospital, Osaka, Japan
3. Department of Metabolism and Clinical Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
4. Department of Endocrinology and Metabolism, Jichi Medical School, Tochigi, Japan
5. College of Medical Technology, Kyoto University, Kyoto, Japan