1. Department of Medicine, University of Florida, 1600 SW Archer Road Gainesville, Gainesville, FL 32610, USA
2. Medical Service, Malcom Randall VA Medical Center, 1601 SW Archer Road, Box 111-D, Gainesville, FL 32608, USA
3. Division of Cardiology, University of Florida, 1600 SW Archer Road Gainesville, Gainesville, FL 32610, USA