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Cesarean SectionPregnant WomenGESTATIONAL AGEVaginal DeliveryObstetrics and GynecologyInduction of LaborPreterm BirthPreterm DeliveryPostpartum HemorrhageMode of DeliveryImage SizePerinatal MortalityEctopic PregnancyEarly PregnancyPostmenopausal WomenNulliparous WomenAmniotic FluidRandomized Controlled Trialin Vitro FertilizationFirst Trimester