1. Department of Clinical Science, National Hospital Organization Okayama Medical Center
2. Division of Cardiology, National Hospital Organization Okayama Medical Center
3. Department of Clinical Pathology, National Hospital Organization Okayama Medical Center
4. Department of Cardiovascular Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
5. Department of Thoracic Surgery, Kyoto University Graduate School of Medicine