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Würfel, W., Krüsmann, G., Hirsch, P. et al. Down syndrome (trisomy 21) in a pregnancy after intratubal embryo transfer (IVF/IT-ET). J Assist Reprod Genet 7, 63–64 (1990). https://doi.org/10.1007/BF01133887
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DOI: https://doi.org/10.1007/BF01133887