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Pellman, Elliot J.1,2; Viano, David C.1,3; Casson, Ira R.1,4,5,6; Tucker, Andrew M.1,7; Waeckerle, Joseph F.1,8; Powell, John W.1,9; Feuer, Henry1,10
Concussion in professional football:​ repeat injuries—Part 4
Neurosurgery. October 2004;​55(4):​860-876