1. Department of Endocrinology and Diabetes, Yokohama City University Medical Center, Yokohama 232-0024, Japan
2. Division of Cardiology, Yokohama City University Medical Center, Yokohama 232-0024, Japan
3. Kanazawa Medical Clinic, Yokohama 220-0012, Japan
4. Department of Endocrinology and Metabolism, Yokohama City University School of Medicine, Yokohama 236-0004, Japan