Age DistributionAge FactorsIncidenceReticulocyte CountInfant, NewbornSeasonsSex DistributionPrevalenceSex FactorsRetrospective StudiesPandemicsRisk FactorsInfluenza, HumanPopulation GrowthRegistriesDisease OutbreaksPopulation SurveillanceSeroepidemiologic StudiesEnglandMeasles VaccineInfluenza A Virus, H1N1 SubtypeUnited StatesMeaslesWalesMaternal AgeTime FactorsJapanFranceHospitalizationCross-Sectional StudiesCause of DeathGreat BritainCohort StudiesDown SyndromeGene DuplicationBrazilAgingChinaPregnancyEpidemiologic MethodsIsraelGermanyCanadaAge of OnsetPopulation DynamicsVaccinationFollow-Up StudiesProspective StudiesModels, StatisticalDeveloping CountriesQuestionnairesIndiaEvolution, MolecularSurvival RateGestational AgeModels, BiologicalBreast NeoplasmsNeoplasmsRisk AssessmentPrognosisDatabases, FactualMortalityModels, TheoreticalPhylogenyTreatment OutcomeNew ZealandAccidentsRural PopulationMalaysiaPoisson DistributionChickenpoxNigeriaAustraliaPakistanUrban PopulationSocioeconomic FactorsRural HealthSpainSingaporeHealth SurveysCase-Control StudiesLife ExpectancyAccidents, TrafficOdds RatioMass ScreeningScotlandHospitals, TeachingLogistic ModelsItalyUrban HealthSouth AfricaRiskEuropean Continental Ancestry GroupResidence CharacteristicsEthnic GroupsRegression AnalysisConfidence IntervalsDemographySwedenLongitudinal Studies