Funding for this research was provided by:
Centers for Disease Control and Prevention (R49/CE000674-01 and R49/CE001172-01)
National Collegiate Athletic Association
Received: 9 April 2018
Accepted: 23 July 2018
First Online: 3 September 2018
Ethics approval and consent to participate
: The institutional review board of Nationwide Children’s Hospital and the Research Review Board of the NCAA approved the study. Individual athlete consent to participate is not acquired in the three national surveillance systems which supplied data for this study.
: Not applicable
: The authors declare that they have no competing interests.
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