PubMed · 55633
Letter: Congenital abnormalities and first-trimester exposure to progestagen/oestrogen.
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J J Nora, A H Nora, A G Perinchief, J W Ingram, A K Fountain, M J Peterson. 1976-02-07. Letter: Congenital abnormalities and first-trimester exposure to progestagen/oestrogen.. https://doi.org/10.1016/s0140-6736(76)91455-0
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