1. Department of Cardiovascular Medicine, Hokkaido University Hospital
2. Department of Cardiovascular Medicine, Sapporo City General Hospital
3. Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center
4. Department of Biostatistics, Graduate School of Medicine, Hokkaido University
5. Department of Cardiovascular Surgery, Nippon Medical School
6. Department of Research and Development, Tachikawa Medical Center
7. Okayama City Hospital
8. Department of Internal Medicine, Faculty of Medicine, Kindai University