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Robert Winston gave the figure of five embryos for every live birth some years ago in a personal communication. Anecdotal evidence to John Harris from a number of sources confirms this high figure, but the literature is rather more conservative, making more probable a figure of three embryos lost for every live birth. See: Boklage CE. Survival probability of human conceptions from fertilization to term. International Journal of Fertility 1990;35:75-94. See also: Leridon H. Human Fertility: The Basic Components. Chicago: University of Chicago Press; 1977. Again, in a recent personal communication, Henri Leridon confirmed that a figure of three lost embryos for every live birth is a reasonable conservative figure.
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Robert Winston gave the figure of five embryos for every live birth some years ago in a personal communication. Anecdotal evidence to John Harris from a number of sources confirms this high figure, but the literature is rather more conservative, making more probable a figure of three embryos lost for every live birth. See: Boklage CE. Survival probability of human conceptions from fertilization to term. International Journal of Fertility 1990;35:75-94. See also: Leridon H. Human Fertility: The Basic Components. Chicago: University of Chicago Press; 1977. Again, in a recent personal communication, Henri Leridon confirmed that a figure of three lost embryos for every live birth is a reasonable conservative figure.
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What if there is a "sunset clause" on the Y chromosome? A view on reproductive technologies in the future
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Trounson AO. What if there is a "sunset clause" on the Y chromosome? a view on reproductive technologies in the future. Medical Journal of Australia 1999;171:660-2.
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New York: Oxford University Press
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Harris J. The Value of Life. London: Routledge; 1980; Harris J. Wonderwoman and Superman. New York: Oxford University Press; 1992. Savulescu J. Procreative beneficence: why we should select the best children. Bioethics 2001;15:413-26.
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Harris J. The Value of Life. London: Routledge; 1980; Harris J. Wonderwoman and Superman. New York: Oxford University Press; 1992. Savulescu J. Procreative beneficence: why we should select the best children. Bioethics 2001;15:413-26.
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note
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After a difficult and fractious courtship, we have both learned to love or at least admire the perfection of one goddess - the creation lottery. Those who believe that natural reproduction is permissible are committed to the worship of this goddess. They are committed to the permissibility of cloning and other Frankenstein reproductive technologies.
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