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Callahan, T.L., Hall, J.E., Ettner, S.L., Christiansen, C.L., Greene, M.F. and Crowley Jr., W.F. (1994) The Economic Impact of Multiple-Gestation Pregnancies and the Contribution of Assisted-Reproduction Techniques to Their Incidence. The New England Journal of Medicine, 331, 244-249.
http://dx.doi.org/10.1056/NEJM199407283310407
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