RT Journal Article SR Electronic T1 Clinical Note on the Hidden Heart 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 1007 OP 1007 DO 10.1136/bjsports-2013-092598 VO 48 IS 12 A1 P B Sparling YR 2014 UL http://bjsm.bmj.com/content/48/12/1007.1.abstract AB