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