1 Division of Cardiovascular Disease, Department of Internal Medicine, University of Alabama at Birmingham, 1808 7th Avenue South, BDB 201, Birmingham, AL, 35244, USA.
2 Division of Cardiovascular Disease, Department of Internal Medicine, University of Alabama at Birmingham, 1808 7th Avenue South, BDB 201, Birmingham, AL, 35244, USA. slloyd@uabmc.edu.
3 Birmingham VA Medical Center, Birmingham, AL, USA. slloyd@uabmc.edu.