RT Journal Article SR Electronic T1 Concussion JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 981 OP 981 DO 10.1503/cmaj.120511 VO 185 IS 11 A1 Purcell, Laura A1 Kissick, Jamie A1 Rizos, John YR 2013 UL http://www.cmaj.ca/content/185/11/981.abstract AB