1. Division of Cardiology, Department of Internal Medicine, Jeonbuk National University Medical School and Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.
2. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
3. Department of Cardiology in Internal Medicine, School of Medicine, Chungnam National University and Regional Cardiocerebrovascular Center, Chungnam National University Hospital, Daejeon, Korea.
4. Cardiovascular Center and Division of Cardiology, Department of Internal Medicine, Eulji University Hospital, College of Medicine, Eulji University, Daejeon, Korea.