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QuestionnairesData CollectionPopulation SurveillanceUnited StatesCross-Sectional StudiesFoodborne DiseasesRegistriesHealth Knowledge, Attitudes, PracticeOnline SystemsEthiopiaInterviews as TopicRisk FactorsComputer SystemsDatabases, FactualInternetHealth Care SurveysPrevalenceResearch DesignSocioeconomic FactorsStudentsNigeriaIncidenceRural PopulationMedical Records Systems, ComputerizedWounds and InjuriesReproducibility of ResultsHealth BehaviorTime FactorsProspective StudiesQualitative ResearchProgram EvaluationPilot ProjectsHealth SurveysFamily CharacteristicsPatient Acceptance of Health CareLogistic ModelsAttitude of Health PersonnelHealth PersonnelAge FactorsInfant, NewbornIndiaTreatment OutcomeQuality of Health CareFeasibility StudiesPregnancyGreat BritainQuality Assurance, Health CareCohort StudiesSex FactorsChinaResidence CharacteristicsSoftwareRetrospective StudiesHealth Services ResearchEnglandUrban PopulationAttitude to HealthHealth Services AccessibilityBrazilRisk-TakingPhysician's Practice PatternsPatient Education as TopicMass ScreeningHealth PromotionAge DistributionPatient ComplianceOutcome Assessment (Health Care)Sex DistributionRisk AssessmentQuality of LifeLongitudinal StudiesHealth StatusSmokingOdds RatioNeoplasmsCase-Control StudiesChronic DiseaseMultivariate AnalysisHIV InfectionsSeverity of Illness IndexFollow-Up StudiesSpecimen HandlingUser-Computer InterfaceEnvironmental MonitoringComputers, HandheldInformation Storage and RetrievalAir MicrobiologyAutomatic Data ProcessingSystems IntegrationEntomologyUrine Specimen CollectionInformation SystemsAlgorithmsPublic Health InformaticsDatabase Management SystemsRecords as TopicOccupational ExposureMedicine, African TraditionalEquipment DesignEthnobotany