1. Department of Cardiovascular Medicine Nippon Medical School 1‐1‐5, Sendagi, Bunkyo‐ku Tokyo 113‐0022 Japan
2. National Heart Centre Singapore Singapore
3. Division of Cardiology, Department of Internal Medicine National Cerebral and Cardiovascular Center Hospital Osaka Japan
4. Department of Cardiology Tokyo Women's Medical University School of Medicine Tokyo Japan
5. Division of Cardiovascular Medicine, Department of Internal Medicine Toho University Omori Hospital Tokyo Japan
6. Division of Cardiology, Department of Internal Medicine Kindai University School of Medicine Osaka Japan