1. Department of CardiologySakakibara Heart Institute of Okayama Okayama Japan
2. Department of Cardiovascular TherapeuticsOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Okayama Japan
3. Department of CardiologyFukuyama City Hospital Fukuyama Japan
4. Department of CardiologyTsuyama Central Hospital Okayama Japan
5. Department of CardiologyKagawa Prefecture Central Hospital Kagawa Japan
6. Department of Cardiovascular MedicineOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Okayama Japan