RT Journal Article SR Electronic T1 Correction 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 991 OP 991 DO 10.1136/bjsports-2012-090409 VO 47 IS 15 YR 2013 UL http://bjsm.bmj.com/content/47/15/991.abstract AB