1. Department of Cardiovascular Medicine, Aso Medical Center, Aso, Japan.
2. Department of Cerebrovascular and Acute Coronary Syndrome, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan.
3. Department of Cardiology, Kumamoto Central Hospital, Kumamoto, Japan.
4. Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan.
5. Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan.