AU  - Guskiewicz KM, McCrea M, Marshall SW, et al
TI  - Cumulative effects associated with recurrent concussion in collegiate football players: The ncaa concussion study
PT  - JOUR
DP  - 2003
TA  - JAMA
pages = {2549-2555},
VI  - 290
IP  - 19
AID  - 10.1001/jama.290.19.2549 [doi]
4100  - http://dx.doi.org/10.1001/jama.290.19.2549
SO  - JAMA November 19, 2003 290(19):2549