1. Department of Health Services Administration, University of Alabama at Birmingham, Birmingham, Alabama, USA.
2. School of Nursing, and University of Alabama at Birmingham, Birmingham, Alabama, USA.
3. Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
4. Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA.
5. Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.
6. Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA.