1. Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Division of Cardiology, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea.
3. Division of Cardiology, Department of Medicine, Cardiac Arrhythmia Center, Heart Vascular and Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Cardiac Ablation Solutions, Medtronic, Inc., Minneapolis, MN, USA.