1. John Ochsner Heart and Vascular Institute, Ochsner Clinical School, The University of Queensland School of Medicine, 1514 Jefferson Highway, New Orleans, LA 70121-2483, USA
2. Department of Graduate Medical Education, Ocala Regional Medical Center, 1431 SW 1st Ave, Ocala, FL. 34471, USA
3. Leon H. Charney Division of Cardiology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, USA
4. Department of Physical Therapy and Integrative Physiology Laboratory, College of Applied Health Sciences, University of Illinois at Chicago, 1919 W Taylor St, Chicago, IL 60612, USA