1. Department of Cardiovascular Medicine, Kitasato University School of Medicine
2. Department of Cardiology, Faculty of Medicine, University of Tsukuba
3. Department of Cardiovascular Surgery, Nippon Medical School
4. The Department of Cardiovascular Medicine, Nippon Medical School
5. Department of Cardiology, Saitama Medical University, International Medical Center
6. Department of Cardiovascular Medicine, National Hospital Organization, Wakayama Hospital
7. Department of Medicine II, Kansai Medical University
8. Division of Cardiovascular Center, Kindai University