1. Datalys Center for Sports Injury Research and Prevention, Indianapolis, IN
2. Department of Exercise and Sport Science, University of North Carolina at Chapel Hill
3. Injury Prevention Research Center, University of North Carolina at Chapel Hill
4. Athletic Training Program, Department of Interdisciplinary Health Sciences, Arizona School of Health Sciences, A.T. Still University, Mesa
5. Department of Epidemiology, Colorado School of Public Health, University of Colorado Anschutz, Aurora
6. Palo Alto Medical Foundation Research Institute, CA
7. Lebanon Valley College, Annville, PA
8. Department of Pediatrics, University of Colorado School of Medicine, Aurora
9. Department of Epidemiology, University of North Carolina at Chapel Hill