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Risks and safety of pandemic H1N1 influenza vaccine in pregnancy: Exposure prevalence, preterm delivery, and specific birth defects

VaccinationVaccine SafetyExposure PrevalenceMaternal ImmunizationPreterm DeliverySpecific Birth DefectsMaternal HealthPregnancyInfluenza VaccineFlu VaccinationPublic HealthMedicineHigh-risk PregnancyEpidemiologyEgg-based Vaccine ProductionInfluenza Vaccines