1 Department of Cardiovascular Diseases, John Ochsner Heart and Vascular Institute, Ochsner Clinical School-The University of Queensland School of Medicine, New Orleans, Louisiana. Electronic address: clavie@ochsner.org.
2 Section of Geriatric Cardiology, University of Pittsburgh Medical Center, Geriatric Research, Education and Clinical Center, VA Pittsburgh Medical Center, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.
3 Department of Physical Therapy, Department of Kinesiology and Nutrition, an Integrative Physiology Laboratory, College of Applied Science, University of Illinois at Chicago, Chicago, Illinois.