DOI:
10.1055/s-00000071
Seminars in Neurology
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References
National Federation of State High School Associations.
2017–2018 High School Athletics Participation Survey.
Available at:
http://www.nfhs.org/ParticipationStatistics/PDF/2017-18%20High%20School%20Athletics%20Participation%20Survey.pdf
. Accessed August 23, 2018
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