1. Department of Exercise and Sport Science
2. Injury Prevention Research Center, University of North Carolina at Chapel Hill
3. Department of Epidemiology, Program for Injury Prevention, Education and Research, Colorado School of Public Health, University of Colorado Anschutz
4. Department of Pediatrics, University of Colorado School of Medicine, Aurora
5. Department of Athletic Training, Lebanon Valley College, Annville, PA
6. Department of Epidemiology, University of North Carolina at Chapel Hill