Key points are not available for this paper at this time.
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
Eckstrom et al. (Wed,) studied this question.