1. Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL, USA
2. Division of Preventive Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
3. Gramercy Research Group, Winston-Salem, NC, USA
4. Sport, Health, and Activity Research and Policy Center, University of Michigan, Ann Arbor, MI, USA
5. Department of Acute, Chronic, and Continuing Care, University of Alabama at Birmingham, Birmingham, AL, USA