1. Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA.
2. Department of Medicine, Thomas Jefferson University Hospital, Philadelphia, PA, USA.
3. Division of Cardiology, Jefferson Heart Institute, Department of Medicine, Thomas Jefferson University Hospital, Philadelphia, PA, USA.
4. Section of Cardiac Electrophysiology, Temple Heart and Vascular Institute, Department of Medicine, Lewis Katz School of Medicine at the Temple University Hospital, Philadelphia, PA, USA.
5. Division of Cardiology, Children's Hospital of Philadelphia, Philadelphia, PA, USA.