Affiliation: | 1.Medicine Service, VA Medical Center, Faculty Office Tower 805B, University of Alabama, 510, 20th street South, FOT 805B, Birmingham, AL, 35233, USA ;2.Department of Medicine at School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA ;3.Division of Epidemiology at School of Public Health, University of Alabama at Birmingham, 1720 Second Ave South, Birmingham, AL, 35294-0022, USA ; |