Daniel G. Seigel, Pregnancy, the Puerperium and the Steroid Contraceptive, The Milbank Memorial Fund Quarterly, Vol. 50, No. 1, Part 2: The Epidemiology of Venous Thrombosis. The Proceedings of a Workshop. Held at the National Institutes of Health Bethesda, Maryland, March 22-23,1971 (Jan., 1972), pp. 15-23
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Daniel Seigel (1972) studied this question.
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