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Smith, S., Scott, L. & Hosid, S. Combined intrauterine triplet and ectopic pregnancy following pronuclear embryo transfer in a patient with elevated serum progesterone during ovulation induction. J Assist Reprod Genet 10, 478–480 (1993). https://doi.org/10.1007/BF01212937
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DOI: https://doi.org/10.1007/BF01212937