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Willard Cates, Jr., Kenneth F. Schulz, David A. Grimes, Carl W. Tyler, Jr., 1. The Effect of Delay and Method Choice on the Risk of Abortion Morbidity, Family Planning Perspectives, Vol. 9, No. 6 (Nov. - Dec., 1977), pp. 266-268+273
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Cates et al. (1977) studied this question.
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