RT Journal Article SR Electronic T1 Emergency +: mobile app user guide 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 538 OP 539 DO 10.1136/bjsports-2017-097775 VO 52 IS 8 A1 Anderson, Nash A1 Sharp, Natalie YR 2018 UL http://bjsm.bmj.com/content/52/8/538.abstract AB