British Journal of Sports Medicine · 2006 · 270 citations · 30 references
It was found that concussions are considerably under-reported to the BCAHA by youth hockey players and team personnel.
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Cumulative Effects of Concussion in High School Athletes
Michael W. Collins, Mark R. Lovell, Grant L. Iverson et al. · Neurosurgery · 2002 · 473 citations
How valid is a self reported 12 month sports injury history?: Figure 1
Belinda J. Gabbe, Caroline F. Finch, Kim L. Bennell et al. · British Journal of Sports Medicine · 2003 · 352 citations · Full text