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Philip T. Eckstrom, Frank R. Brand, Stanley A. Edlavitch, Henry M. Parrish, Epidemiology of Stroke in a Rural Area: Second Year of the Mid-Missouri Stroke Survey, Public Health Reports (1896-1970), Vol. 84, No. 10 (Oct., 1969), pp. 878-882
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Eckstrom et al. (1969) studied this question.
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