OntarioDisabled PersonsCanadaQuestionnairesRisk FactorsMentally Ill PersonsPrevalenceUnited StatesCross-Sectional StudiesIncidencePopulation SurveillanceCohort StudiesHomeless PersonsRetrospective StudiesSex FactorsAge FactorsTime FactorsHIV InfectionsAge DistributionDisease OutbreaksSocioeconomic FactorsVisually Impaired PersonsMentally Disabled PersonsHealth Services AccessibilityPhysician's Practice PatternsRural PopulationLogistic ModelsData CollectionSex DistributionCattle DiseasesSeverity of Illness IndexHealth SurveysFamily PracticeProspective StudiesTreatment OutcomeHospitalizationHealth StatusSeasonsInterviews as TopicHealth Knowledge, Attitudes, PracticeQuality of LifePain MeasurementHealth Services Needs and DemandFollow-Up StudiesIndians, North AmericanUrban PopulationAbattoirsNational Health ProgramsWaiting ListsMass ScreeningResidence CharacteristicsRegistriesDisability EvaluationLongitudinal StudiesOsteoarthritis, Hip