RT Journal Article SR Electronic T1 Commotio cordis: sudden death due to chest wall impact in sports JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 109 OP 110 DO 10.1136/hrt.81.2.109 VO 81 IS 2 A1 MARK S LINK YR 1999 UL http://heart.bmj.com/content/81/2/109.abstract AB