1. Division of Cardiology; Sakurabashi Watanabe Hospital; Osaka Japan
2. Cardiology Department; Saitama Sekishinkai Hospital; Saitama Japan
3. Division of Cardiology; Saitama Prefecture Cardiovascular and Respiratory Center; Saitama Japan
4. Department of Cardiology; Toyohashi Heart Center; Aichi Japan
5. Japan Community Health Care Organization Hokkaido Hospital; Cardiovascular Center; Hokkaido Japan
6. Kyoto Katsura Hospital; Cardiovascular Center; Kyoto Japan
7. Department of Cardiology; Saiseikai Yokohama-City Eastern Hospital; Kanagawa Japan
8. Division of Cardiology; Sapporo CardioVascular Clinic; Hokkaido Japan
9. Department of Cardiology; Takase Clinic; Gunma Japan