Estimated age of first exposure to American football and outcome from concussion.

Caccese JB, Houck Z, Kaminski TW, Clugston JR, Iverson GL, Bryk KN, Oldham JR, Pasquina PF, Broglio SP, McAllister TW, McCrea M, Hoy AMR, Hazzard JB Jr, Kelly LA, Ortega JD, Port N, Putukian M, Langford TD, Giza CC, Goldman JT, Benjamin HJ, Schmidt JD, Feigenbaum LA, Eckner JT, Mihalik JP, Miles JD, Anderson S, Master CL, Collins MW, Kontos AP, Chrisman SPD, Brooks A, Jackson JC, McGinty G, Cameron KL, Susmarski A, O'Donnell PG, Duma S, Rowson S, Miles CM, Bullers CT, Dykhuizen BH, Lintner L, Buckley TA; and the CARE Consortium Investigators.