RT Journal Article SR Electronic T1 Sickle cell trait, exertion-related death and confounded estimates 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 285 OP 286 DO 10.1136/bjsports-2012-091619 VO 48 IS 4 A1 Steven D Stovitz A1 Ian Shrier YR 2014 UL http://bjsm.bmj.com/content/48/4/285.abstract AB