Incidence and Risk Factors for Concussion in High School Athletes, North Carolina, 1996–1999.
Schulz, Mark R.; Marshall, Stephen W.; Mueller, Frederick O.; Jingzhen Yang; Weaver, Nancy L.; Kalsbeek, William D.; Bowling, J. Michael; American Journal of Epidemiology, 2004, vol. 160, issue 10, p 937, ISSN 00029262. ISBN 00029262.

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