1. Department of Cardiology Japanese Red Cross Ashikaga Hospital Ashikaga Japan
2. Department of Cardiology Keio University School of Medicine Tokyo Japan
3. Department of Cardiovascular Medicine Gunma University Graduate School of Medicine Maebashi Japan
4. Department of Cardiovascular Medicine Kyoto University Graduate School of Medicine Kyoto Japan
5. Department of Cardiology Aichi Medical University Nagakute Japan
6. Division of Cardiovascular Medicine Toho University Ohashi Medical Center Tokyo Japan
7. Division of Cardiology Tokai University School of Medicine Isehara Japan