1. Division of Cardiology, Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
2. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
3. Department of Pathology, Dong-A University College of Medicine, Busan, Korea.
4. Department of Cardiovascular Surgery, Dong-A University College of Medicine, Busan, Korea.