1. Department of Cardiovascular Medicine; Graduate School of Medicine, Kyoto University; Japan
2. Division of Clinical Epidemiology; Hyogo College of Medicine; Japan
3. Division of Cardiology; Kobe City Medical Center General Hospital; Japan
4. Division of Cardiology; Tenri Hospital; Japan
5. Division of Cardiology; Kokura Memorial Hospital; Japan
6. Division of Cardiology; Kurashiki Central Hospital; Japan