Funding for this research was provided by:
Centers for Disease Control and Prevention (R49/CE002106-01, R49/CE000674-01, R49/CE001172-01)
Received: 27 January 2020
Accepted: 23 March 2020
First Online: 13 April 2020
Ethics approval and consent to participate
: Consent to participate was neither required nor possible in this retrospective ecological study which consisted of secondary analysis of a pre-existing surveillance dataset containing no student-athlete personal identifiers and no student athlete-level sensitive information. The High School RIO surveillance system, which supplied the data analyzed in this study, was approved by the Nationwide Children’s Hospital Subjects Review Board (Columbus, OH) and the Colorado Multiple Institutional Review Board (Aurora, CO), the second of which provided approval under the “exempt, not human subjects research” category.
: Not applicable.
: The authors declare that they have no competing interests<b>.</b>