1. Department of Kinesiology and Health Education, The University of Texas at Austin, Austin, Texas
2. Department of Health Administration, Brooks College of Health, University of North Florida, Jacksonville, Florida
3. Department of Emergency Medicine, School of Medicine
4. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina
5. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, Maryland, USA