1. Division of Cardiology, Heart Stroke Vascular Center, Mediplex Sejong General Hospital, Incheon, Korea.
2. Division of Cardiology, Department of Internal Medicine, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Korea.
3. Division of Cardiology, Cardiovascular Center, Mediplex Sejong Hospital, Incheon, Korea.
4. Division of Cardiology, Department of Internal Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Heart Research Center, Chonnam National University College of Medicine, Gwangju, Korea.