1. Division of CardiologyJapanese Red Cross Wakayama Medical Center Wakayama Japan
2. Department of Cardiovascular MedicineGraduate School of Medicine, Kyoto University Kyoto Japan
3. Division of Clinical EpidemiologyHyogo College of Medicine Nishinomiya Japan
4. Division of CardiologyKobe City Medical Center General Hospital Kobe Japan
5. Division of CardiologyTenri Hospital Tenri Japan
6. Division of CardiologyKokura Memorial Hospital Kitakyushu Japan
7. Division of CardiologyKurashiki Central Hospital Kurashiki Japan
8. Department of Cardiovascular MedicineSaga University Saga Japan
9. Department of Cardiovascular SurgeryGraduate School of Medicine, Kyoto University Kyoto Japan
10. Department of Cardiovascular Surgery, Cardiovascular CenterKitano Hospital, Tazuke Kofukai Medical Research Institute Osaka Japan
11. Department of Cardiovascular SurgeryKurashiki Central Hospital Kurashiki Japan