Commotio cordis: early observation.
Kohl
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D001145:Arrhythmias, Cardiac / Q000150:complications / Q000266:history; D016757:Death, Sudden, Cardiac / Q000209:etiology*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D014949:Wounds, Nonpenetrating / Q000150:complications / Q000266:history*