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Vaginal progesterone decreases preterm birth <34 weeks of gestation in women with a singleton pregnancy and a short cervix: an updated meta-analysis including data from the OPPTIMUM study.
Romero R, Nicolaides KH, Conde-Agudelo A, O'Brien JM, Cetingoz E, Da Fonseca E, Creasy GW, Hassan SS.
Ultrasound Obstet Gynecol 2016;48:308-17. pdf