1. Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine
2. Division of Cardiology, Asan Medical Center, University of Ulsan College of Medicine
3. Department of Clinical Laboratory, The Sakakibara Heart Institute of Okayama
4. Department of Cardiology, Miyazaki Medical Association Hospital Cardiovascular Center
5. Department of Cardiology, The Sakakibara Heart Institute of Okayama
6. Department of Cardiovascular Surgery, University of Occupational and Environmental Health, School of Medicine
7. Cardiac Ultrasound Laboratory, Massachusetts General Hospital, Harvard Medical School