Progestogens to prevent preterm birth in twin pregnancies: an individual participant data meta-analysis of randomized trials.
Schuit E, Stock S, Groenwold RH, Maurel K, Combs CA, Garite T, Spong CY, Thom EA, Rouse DJ, Caritis SN, Saade GR, Zachary JM, Norman JE, Rode L, Klein K, Tabor A, Ceting?z E, Morrison JC, Magann EF, Briery CM, Serra V, Perales A, Meseguer J, Nassar AH, Lim AC, Moons KG, Kwee A, Mol BW. Progestogens to prevent preterm birth in twin pregnancies: an individual participant data meta-analysis of randomized trials. BMC Pregnancy Childbirth. 2012 Mar 15; 12:13.