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Quadrivalent versus trivalent influenza vaccine: clinical outcomes in two influenza seasons, historical cohort study

VaccinationVaccine SafetyCross-protectionPreventive MedicineClinical EpidemiologyInfluenza SeasonsHistorical Cohort StudyClinical OutcomesVaccine EfficacyInfluenza VaccineFlu VaccinationPublic HealthPolyvalent VaccineMedicineEpidemiologyEgg-based Vaccine ProductionInfluenza Vaccines