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Am J Obstet Gynecol. 1977 Mar 15;127(6):612-5. doi: 10.1016/0002-9378(77)90359-3.
Serum progesterone and estradiol-17beta levels in premature and term labor.
Cousins LM, Hobel CJ, Chang RJ, Okada DM, Marshall JR
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Am J Obstet Gynecol. 1977 Mar 15;127(6):612-5. doi: 10.1016/0002-9378(77)90359-3.
Cousins LM, Hobel CJ, Chang RJ, Okada DM, Marshall JR