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The frequencies of prior cardiovascular abnormalities were compared in 117 stroke patients and 234 control subjects. All were residents of a retirement community who had been examined initially and followed in the local medical clinic before the strokes occurred. Cases and controls were matched for age, sex, length of residence, and blood pressure.doi:10.1161/01.cir.38.3.533 pmid:5673605 fatcat:3o5ij6fva5butdoqssjl6nczfu