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 e4 OP e4 DO 10.1136/bjsm.2006.030700 VO 44 IS 13 YR 2010 UL http://bjsm.bmj.com/content/44/13/e4.abstract AB