1. Department of Cardiovascular Medicine, Saga University, Saga, Japan
2. Department of Clinical Epidemiology, Hyogo College of Medicine, Nishinomiya, Japan
3. Division of Cardiology, Kokura Memorial Hospital, Kitakyushu, Japan
4. Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
5. Division of Cardiology, Tenri Hospital, Tenri, Japan
6. Department of Cardiovascular Medicine, Kobe City Medical Center General Hospital, Kobe, Japan
7. Division of Cardiology, Kurashiki Central Hospital, Kurashiki, Japan
8. Department of Cardiovascular Medicine, Wakayama Medical University, Wakayama, Japan
9. Division of Cardiology, Hanaokaseishu Memorial Cardiovascular Clinic, Sapporo, Japan
10. Division of Cardiology, Teikyo University Hospital, Tokyo, Japan
11. Division of Cardiology, Mitsui Memorial Hospital, Tokyo, Japan
12. Division of Cardiology, Iwate Medical University Hospital, Morioka, Japan
13. Division of Cardiology, Tokyo Hospital, Tokyo, Japan