RT Journal Article SR Electronic T1 Drugs in sport: the pressure to perform 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 505 OP 506 DO 10.1136/bjsm.2003.008342 VO 38 IS 4 A1 A D J Webborn YR 2004 UL http://bjsm.bmj.com/content/38/4/505.3.abstract AB