1 Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Lyons Harrison Research Building 306, 1720 2nd Ave S, Birmingham, AL, 35294-0007, USA. rsaab@uabmc.edu.
2 Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Lyons Harrison Research Building 306, 1720 2nd Ave S, Birmingham, AL, 35294-0007, USA.
3 Section of Cardiology, Birmingham Veterans Affairs Medical Center, Birmingham, AL, USA.