1. Department of Cardiology; Kishiwada Tokushukai Hospital; Osaka Japan
2. Cardiovascular Center; Kansai Rosai Hospital; Hyogo Japan
3. Cardiovascular Center; Takatsu General Hospital; Kanagawa Japan
4. Cardiovascular Center; Morinomiya Hospital; Osaka Japan
5. Division of Cardiovascular Medicine; Toho University Ohashi Medical Center; Tokyo Japan
6. Department of Cardiology; Kokura Memorial Hospital; Fukuoka Japan
7. Department of Cardiovascular Medicine; Omihachiman Community Medical Center; Shiga Japan