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Olivennes, F., Frydman, R., Rufat, P. et al. How to halve the prematurity rates of in vitro fertilization pregnancies in 4 days. J Assist Reprod Genet 9, 406–407 (1992). https://doi.org/10.1007/BF01203969
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DOI: https://doi.org/10.1007/BF01203969