1. Department of Cardiology in Internal Medicine, Chungnam National University School of Medicine, Chungnam National University Hospital, Daejeon, Korea.
2. Department of Pathology, Chungnam National University School of Medicine, Chungnam National University Hospital, Daejeon, Korea.
3. Department of Thoracic Surgery, Chungnam National University School of Medicine, Chungnam National University Hospital, Daejeon, Korea.