CanadaSulfonesPurinesPiperazinesPhosphodiesterase InhibitorsPhosphodiesterase 5 Inhibitors3',5'-Cyclic-GMP PhosphodiesterasesErectile DysfunctionCyclic Nucleotide Phosphodiesterases, Type 5OntarioBritish ColumbiaHomosexuality, MalePenile ErectionAlbertaMethamphetamineVasodilator AgentsQuebecCyclic GMPManitobaGeorgiaNova ScotiaNorthwest TerritoriesSaskatchewanNunavutUnsafe SexArctic RegionsNewfoundland and LabradorInuitsRisk-TakingSexual BehaviorYukon TerritoryIndians, North AmericanNew BrunswickPrince Edward IslandAmerican Native Continental Ancestry GroupQuestionnairesNational Health ProgramsRisk FactorsSocieties, MedicalPrevalenceChromosome DeletionEmigration and ImmigrationHealth SurveysMedical TourismData CollectionSingle-Payer SystemCross-Sectional StudiesPhysiciansIncidencePhysician's Practice PatternsAge FactorsGastroenterologyPopulation SurveillanceTime FactorsPractice Guidelines as TopicGeneral SurgeryInfant, NewbornRetrospective StudiesCohort StudiesAge DistributionHealth Care SurveysInternship and ResidencySex FactorsEmigrants and ImmigrantsGeeseHealth Services AccessibilityDisease OutbreaksVeterinariansLogistic ModelsMutationNorth AmericaHealth PolicySex DistributionPopulation GroupsWaiting ListsFounder EffectAttitude of Health PersonnelSocioeconomic FactorsSpecializationTreatment OutcomeConsumer Product SafetyResidence CharacteristicsRisk AssessmentHospitalizationForeign Medical GraduatesRural Health ServicesGenotypeDelivery of Health CareSeasonsEducation, Medical, GraduateHealth Care Costs