1 Faculty of Medicine, Al-Azhar University, Cairo, Egypt.
2 Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
3 Division of Cardiology, Department of Medicine, Duke University School of Medicine, Durham, NC.
4 Division of Cardiology, Montefiore Health System/Albert Einstein College of Medicine, Bronx, NY. Electronic address: lslipczukb@montefiore.org.
5 John Ochsner Heart and Vascular Institute, Department of Cardiovascular Diseases, Ochsner Clinical School, The University of Queensland School of Medicine, New Orleans, LA.