*Division of Sports Medicine, Boston Children's Hospital, Boston, Massachusetts;
†Micheli Center for Sports Injury Prevention, Waltham, Massachusetts;
‡Cerebrovascular Research Laboratory, Spaulding Rehabilitation Hospital, Boston, Massachusetts;
§Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts;
¶Departments of Orthopedic Surgery and Pediatrics, Harvard Medical School, Boston, Massachusetts;
‖Sports Medicine Center, Children's Hospital Colorado, Aurora, Colorado; and
**Department of Orthopedics, University of Colorado School of Medicine, Aurora, Colorado.
Corresponding Author: David R. Howell, PhD, ATC, Sports Medicine Center, Children's Hospital Colorado, University of Colorado School of Medicine, 13123 E. 16th Ave, B060 Aurora, CO 80045 ([email protected]).
Supported by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (R03HD094560) and the National Institute of Neurological Disorders and Stroke (R03NS106444).
Unrelated to this study, D. R. Howell has received research support from the National Institute of Neurological Disorders And Stroke (R01NS100952 and R43NS108823) and MINDSOURCE Brain Injury Network. W. P. Meehan receives royalties from (1) ABC-Clio publishing for the sale of his books, Kids, Sports, and Concussion: A guide for coaches and parents, and Concussions; (2) Springer International for the book Head and Neck Injuries in the Young Athlete and (3) Wolters Kluwer for working as an author for UpToDate. His research is funded, in part, by philanthropic support from the National Hockey League Alumni Association through the Corey C. Griffin Pro-Am Tournament and a grant from the National Football League. C. O. Tan serves as a data science consultant to Lokavant Inc. and received consultancy fees.
Trial Registration: Clinicaltrials.gov identifier: NCT03170856 (https://clinicaltrials.gov/ct2/show/NCT03170856).