Age DistributionAge FactorsReticulocyte CountIncidenceSeasonsInfant, NewbornPandemicsPrevalenceSex DistributionInfluenza, HumanPopulation GrowthMeasles VaccineInfluenza A Virus, H1N1 SubtypeMeaslesMaternal AgeDisease OutbreaksRetrospective StudiesSex FactorsPopulation SurveillanceRegistriesUnited StatesRisk FactorsTime FactorsDown SyndromeGene DuplicationJapanWalesFranceEnglandSeroepidemiologic StudiesIsraelGermanyAge of OnsetPregnancyPopulation DynamicsHospitalizationChinaModels, StatisticalDeveloping CountriesGreat BritainEvolution, MolecularGestational AgeCohort StudiesAgingModels, BiologicalBrazilEpidemiologic MethodsVaccinationCanadaDatabases, FactualCause of DeathModels, TheoreticalSurvival RateCross-Sectional StudiesFollow-Up StudiesProspective StudiesPhylogenyPrognosisNeoplasmsBreast NeoplasmsQuestionnairesRisk AssessmentTreatment Outcome