1. Department of Endocrinology and Diabetes, Yokohama City University Medical Center, Yokohama 232-0024, Japan
2. Tsunashima East Internal Medicine and Diabetes Clinic, Yokohama 223-0052, Japan
3. Urafune Kanazawa Internal Medicine Clinic, Yokohama 232-0024, Japan
4. Department of Endocrinology and Metabolism, Yokohama City University School of Medicine, Yokohama 236-0004, Japan