1. Division of Cardiovascular Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
2. Department of Medicine, James J. Peters VA Medical Center, Icahn School of Medicine, Bronx, NY, USA
3. Department of Medicine, MedStar Union Memorial Hospital, Baltimore, Maryland, USA
4. Division of Cardiology, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA
5. Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA