1. Division of Cardiology, National Cardiovascular Center
2. Division of Cardiology, National Toyohashi Higashi Hospital
3. The Second Department of Medicine, Nihon University School of Medicine
4. Division of Cardiology, Kanazawa Medical College
5. Division of Cardiology, National Tokyo Medical Center
6. Division of Cardiology, National Kyushu Medical Center
7. Department of Cardiology, Hokkaido University Graduate School of Medicine
8. Division of Cardiology, Third Department of Medicine, Toho University School of Medicine