1. Division of Cardiology, Department of Internal Medicine, Wonkwang University School of Medicine, Iksan, Korea.
2. Department of Cardiology, Kwangju Christian Hospital, Gwangju, Korea.
3. Division of Cardiology, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
4. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.