TY - JOUR T1 - Concussion JF - Canadian Medical Association Journal JO - CMAJ SP - 981 LP - 981 DO - 10.1503/cmaj.120511 VL - 185 IS - 11 AU - Laura Purcell AU - Jamie Kissick AU - John Rizos Y1 - 2013/08/06 UR - http://www.cmaj.ca/content/185/11/981.abstract N2 - ER -