1. *Department of Biostatistics, Epidemiology, and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia
2. †Penn Injury Science Center, University of Pennsylvania, Philadelphia
3. ‡School of Health and Rehabilitation Sciences, Ohio State University College of Medicine, Columbus
4. §Divisions of Emergency Medicine, Boston Children’s Hospital, MA
5. ¶The Micheli Center for Sports Injury Prevention, Waltham, MA
6. ‖Departments of Pediatrics and Emergency Medicine, Harvard Medical School, Boston, MA
7. #Sports Medicine, Department of Orthopedics, Boston Children’s Hospital, MA
8. **Pediatrics and Orthopedics, Harvard Medical School, Boston, MA
9. ††Department of Kinesiology and Applied Physiology, University of Delaware, Newark
10. ‡‡Interdisciplinary Program in Biomechanics and Movement Science, University of Delaware, Newark