1. Division of Cardiology, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Division of Cardiology, St. Paul's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Thoracic and Cardiovascular Surgery, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. The University of Debrecen Medical and Health Science Center, Debrecen, Hungary.
5. Clinical Research Institute, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
6. Department of Pathology, Hwasun Hospital, Chonnam National University Medical School, Gwangju, Korea.