1. Yutaka Seino Distinguished Center for Diabetes Research, Kansai Electric Power Medical Research Institute, Kobe, Japan
2. Center for Diabetes, Endocrinology and Metabolism, Kansai Electric Power Hospital, Osaka, Japan
3. Center for Metabolism and Clinical Nutrition, Kansai Electric Power Hospital, Osaka, Japan
4. Departments of Endocrinology and Diabetes, Nagoya University Graduate School of Medicine, Nagoya, Japan