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Br J Obstet Gynaecol. 1978 Dec;85(12):927-32. doi: 10.1111/j.1471-0528.1978.tb15855.x.
Secretion patterns of plasma-progesterone, 17-hydroxyprogesterone, and 20alpha hydroxypregn-4-en-3-one in early abnormal pregnancy.
Harrison RF, Youssefnejadian E, Brodovcky H, Johnson M, Dewhurst J
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