RT Journal Article SR Electronic T1 Ivy League–Big Ten Epidemiology of Concussion Study JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP 319 OP 320 DO 10.1136/injuryprev-2018-042831 VO 24 IS 4 A1 Carolyn Campbell-McGovern A1 Bernadette A D’Alonzo A1 Martha Cooper A1 Margot Putukian A1 Douglas J Wiebe YR 2018 UL http://injuryprevention.bmj.com/content/24/4/319.abstract AB