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A prospective, Internet-based study of the effectiveness and safety of influenza vaccination in the 2001–2002 influenza season

VaccinationInternet-based StudyPreventive MedicineEpidemic IntelligenceVaccine SurveillanceInfluenza VaccinationVaccine EfficacyInfluenza VaccineFlu VaccinationPublic HealthInfluenza SeasonMedicineVaccine HesitancyEpidemiologyInfluenza Vaccines