1. Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Osaka, Japan
2. Department of Cardiology, Kawasaki Medical School, Okayama, Japan
3. Department of Plastic Surgery, Yao Tokushukai General Hospital, Osaka, Japan
4. Department of Statistics and Data Analysis, Center for Cerebral and Cardiovascular Disease Information, National Cerebral and Cardiovascular Center, Osaka, Japan
5. Department of Cardiology, Kishiwada Tokushukai Hospital, Osaka, Japan