1. Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine
2. Department of Cardiology, Sakakibara Heart Institute
3. Department of Cardiovascular Surgery, University of Occupational and Environmental Health, School of Medicine
4. Department of Laboratory and Transfusion Medicine, University of Occupational and Environmental Health, School of Medicine
5. Department of Cardiovascular Surgery, Sakakibara Heart Institute
6. Cardiac Ultrasound Laboratory, Massachusetts General Hospital, Harvard Medical School