1. Department of Cardiology, The Heart Institute of Japan; Department of Internal Medicine, Ebara Metropolitan Hospital, Tokyo, Japan
2. Department of Cardiology, The Heart Institute of Japan, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku, Tokyo 162-8666, Japan
3. Department of Medicine, Institute of Clinical Endocrinology, Tokyo Women's Medical University, Japan
4. Department of Internal Medicine, Ebara Metropolitan Hospital, Tokyo, Japan
5. Department of Cardiology, The Heart Institute of Japan