Author Contributions: Dr Emery had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Emery, Shrier, Goulet, Hagel, Benson, Nettel-Aguirre, Meeuwisse.
Acquisition of data: Emery, Shrier, Goulet, McAllister, Meeuwisse.
Analysis and interpretation of data: Emery, Kang, Shrier, Goulet, Hagel, Benson, McAllister, Hamilton, Meeuwisse.
Drafting of the manuscript: Emery, Kang, Shrier, Benson, McAllister, Hamilton, Meeuwisse.
Critical revision of the manuscript for important intellectual content: Emery, Kang, Shrier, Goulet, Hagel, Benson, Nettel-Aguirre, Hamilton.
Statistical analysis: Kang, Shrier, Nettel-Aguirre, Hamilton, Meeuwisse.
Obtained funding: Emery, Shrier, Goulet, Hagel, Meeuwisse.
Administrative, technical, or material support: Kang, Goulet, Benson, McAllister, Hamilton.
Study supervision: Emery, Goulet, Meeuwisse.
Financial Disclosures: None reported.
Funding/Support: This study was funded by the Canadian Institutes of Health Research and the Max Bell Foundation. This research also received support from Hockey Calgary, Hockey Edmonton, Hockey Quebec, Hockey Alberta, Hockey Canada, and the Quebec Ministry of Education, Leisure and Sport. Dr Emery is supported by a Population Health Investigator Award from the Alberta Heritage Foundation, a New Investigator Award from the Canadian Institutes of Health Research, and a Professorship in Pediatric Rehabilitation in the Faculty of Medicine, University of Calgary (Alberta Children's Hospital Foundation). Dr Hagel holds the Alberta Children's Hospital Foundation Professorship in Child Health and Wellness, funded through the support of an anonymous donor and the Canadian National Railway Company, as well as the Alberta Heritage Foundation for Medical Research Population Health Investigator and Canadian Institutes of Health Research New Investigator Awards. Dr Shrier is supported by the Senior Clinician Scientist program of the Fonds de la Recherche en Santé du Quebec.
Role of the Sponsors: The Canadian Institutes of Health Research and the Max Bell Foundation ensured the translation of the findings to all community partners. These sponsors had no role in the design or conduct of the study; the collection, management, analysis, or interpretation of the data; or the preparation, review, or approval of the manuscript.
Additional Contributions: We thank the Pee Wee players, parents, coaches, team designates, physiotherapists, athletic therapists, student therapists, study coordinators, and study physicians for their assistance in completing this research.