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Guskiewicz, Kevin M.1,2,4; McCrea, Michael5,6; Marshall, Stephen W.2,3,4; Cantu, Robert C.1,7; Randolph, Christopher8,10; Barr, William11; Onate, James A.12; Kelly, James P.8,9
Cumulative effects associated with recurrent concussion in collegiate football players:​ the NCAA concussion study
JAMA. November 19, 2003;​290(19):​2549-2555