RT Journal Article SR Electronic T1 Cognitive rest following concussions: rethinking ‘cognitive rest’ JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 147 OP 147 DO 10.1136/bjsports-2016-096674 VO 51 IS 3 A1 Mark E Halstead A1 Brenda Eagan Brown A1 Karen McAvoy YR 2017 UL http://bjsm.bmj.com/content/51/3/147.abstract AB