title: The Sign of Four and the SDNN of one of three.
authors.forename: James D
authors.initials: JD
authors.lastname: Allred
authors.forename: Andrew E
authors.initials: AE
authors.lastname: Epstein
authors.forename: Raymond E
authors.initials: RE
authors.lastname: Ideker
mesh_terms: D016757:Death, Sudden, Cardiac / Q000209:etiology* / Q000517:prevention & control*; D017147:Defibrillators, Implantable / Q000706:statistics & numerical data; D015716:Electrocardiography, Ambulatory; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D012307:Risk Factors; D013318:Stroke Volume