1. Department of Cardiology Keio University School of Medicine Tokyo Japan
2. Department of Cardiovascular Medicine Kyorin University Fuculty of Medicine Tokyo Japan
3. Department of Cardiology National Defense Medical College Hospital Tokorozawa Japan
4. Department of Cardiology Saiseikai Central Hospital Tokyo Japan
5. Department of Cardiology Sakakibara Heart Institute Tokyo Japan
6. Department of Cardiology Saitama Medical University International Medical Center Saitama Japan