HydroxyprogesteronesProgestinsPregnancy, TwinPremature Birth17-alpha-HydroxyprogesteronePregnancy, TripletTocolytic AgentsPregnancyAdrenal Hyperplasia, Congenital17-alpha-HydroxypregnenoloneGestonorone CaproateCaproatesSteroid 21-HydroxylaseCortodoxoneAndrostenedionePregnanetriolPregnanesRecurrenceDehydroepiandrosteroneObstetric Labor, PrematureHyperandrogenism17-KetosteroidsUterine Cervical IncompetenceFluoxymesteroneGestational AgeAdrenocortical HyperfunctionHirsutismProgesterone CongenersInfant, PrematureNafarelinPapio cynocephalusClitorisHydrocortisoneProgesteroneAdrenocorticotropic HormoneInfant, NewbornSteroid 17-alpha-HydroxylaseEstradiol AntagonistsTestosteronePregnenolonePolycystic Ovary SyndromeDehydroepiandrosterone SulfateCervical Length MeasurementAndrogensCosyntropinPentanoic AcidsAdrenal Glands