Randomized comparison of nifedipine and placebo in fibronectin-negative women with symptoms of preterm labor and a short cervix (APOSTEL-I Trial).
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Am J Perinatol. 2015 Apr;32(5):451-60. doi: 10.1055/s-0034-1390346. Epub 2014 Dec 8.
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PMID: 25486290
Clinical Trial.