1. Sports Medicine Center, Children’s Hospital Colorado, Aurora, CO, USA
2. Department of Orthopedics, University of Colorado School of Medicine, Aurora, CO, USA
3. The Micheli Center for Sports Injury Prevention, Waltham, MA, USA
4. Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, USA
5. Division of Sports Medicine, Department of Orthopaedics, Boston Children’s Hospital, Boston, MA, USA
6. Departments of Orthopaedic Surgery and Pediatrics, Harvard Medical School, Boston, MA, USA