RT Journal Article SR Electronic T1 Sudden cardiac death during open water swimming 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 1134 OP 1135 DO 10.1136/bjsports-2012-092021 VO 48 IS 15 A1 Michael J Tipton YR 2014 UL http://bjsm.bmj.com/content/48/15/1134.abstract AB