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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 -
Effectiveness of progestogens to improve perinatal outcome in twin pregnancies: an individual participant data meta-analysis.
Schuit E, Stock S, Rode L, Rouse DJ, Lim AC, Norman JE, Nassar AH, Serra V, Combs CA, Vayssiere C, Aboulghar MM, Wood S, Atetingaz E, Briery CM, Fonseca EB, Worda K, Tabor A, Thom EA, Caritis SN, Awwad J, Usta IM, Perales A.
BJOG 2015;122:27-37. pdf