1. Department of Cardiology, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, Korea.
2. Department of Cardiology, Cardiovascular Center, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
3. Utah Cardiology, Farmington, Utah, USA.
4. Department of Hematology, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, Korea.