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References

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    Murphy M, Hey K, Brown J, Willis B, Ellis JD, Barlow D. Infertility treatment and multiple birth rates in Britain 1938–94. J Biosoc Sci 1997;29: 235243.
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    Mayor S. UK authority sets limits on number of embryos transferred. BMJ 2004;328: 65.
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    BottingBJ, MacfarlaneAJ, PriceFV, editors. Three, Four and More. A Study of Triplet and Higher Order Births. London: HMSO, 1990.
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    Vilska S, Tiitinen A, Hyden-Granskog C, Hovatta O. Elective transfer of one embryo results in an acceptable pregnancy rate and eliminates the risk of multiple birth. Hum Reprod 1999;14(9):23922395.