1 Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
2 Department of Medicine, Division of Cardiology, University of Arkansas for Medical Sciences, 4301 W. Markham St, Little Rock, AR, USA.
3 Department of Medicine, Division of Cardiology, University of Arkansas for Medical Sciences, 4301 W. Markham St, Little Rock, AR, USA. sjalaref@uams.edu.