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 e3 OP e3 DO 10.1136/bjsm.2009.060988 VO 45 IS 8 YR 2011 UL http://bjsm.bmj.com/content/45/8/e3.abstract AB