1. Second Department of Internal Medicine University of Toyama Toyama Japan
2. Department of Cardiology Teikyo University School of Medicine Tokyo Japan
3. Department of Cardiology Saiseikai Utsunomiya Hospital Tochigi Japan
4. Department of Cardiology Keio University School of Medicine Tokyo Japan
5. Department of Cardiology Sendai Kosei Hospital Sendai Japan
6. Department of Cardiology New Tokyo Hospital Chiba Japan
7. Department of Cardiology Saiseikai Yokohama City Eastern Hospital Yokohama Japan
8. Department of Cardiology Shonan Kamakura General Hospital Kanagawa Japan
9. Department of Cardiovascular Medicine, Graduate School of Medical Sciences Kumamoto University Kumamoto Japan
10. Department of Cardiology Kokura Memorial Hospital Kokura Japan
11. Department of Cardiology Kindai University Osaka Japan
12. Department of Cardiovascular Surgery Tokyo Bay Urayasu‐Ichikawa Medical Center Chiba Japan
13. Department of Cardiology Ogaki Municipal Hospital Gifu Japan
14. Department of Cardiology Toyohashi Heart Center Toyohashi Japan