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Metered Dose InhalersNebulizers and VaporizersDry Powder InhalersAdministration, InhalationChlorofluorocarbonsAerosol PropellantsBronchodilator AgentsAlbuterolAerosolsFenoterolBeclomethasonePowdersInhalation SpacersIpratropiumAsthmaAnti-Asthmatic AgentsTerbutalineHydrocarbons, FluorinatedBudesonideRespiratory System AgentsPregnenedionesEquipment DesignForced Expiratory VolumeChlorofluorocarbons, MethaneHoarsenessEthanolaminesAtropine DerivativesDouble-Blind MethodCross-Over StudiesCromolyn SodiumAndrostadienesPeak Expiratory Flow RateAdrenergic beta-AgonistsParticle SizeDrug Delivery SystemsPulmonary Disease, Chronic ObstructiveChild WelfareTechnetiumLung Diseases, ObstructiveDisabled ChildrenBiological AvailabilityPregnadienediolsLungTechnology, PharmaceuticalTreatment OutcomeChild BehaviorChemistry, PharmaceuticalDrug Administration ScheduleGlucocorticoidsVital CapacityRespiratory TherapyHydrocortisoneAnti-Inflammatory AgentsAdrenal Cortex HormonesChild Health ServicesChild RearingDrug CombinationsScopolamine DerivativesChild, InstitutionalizedDose-Response Relationship, DrugBronchiPatient Education as TopicChild Behavior DisordersChild PsychologyChild of Impaired ParentsDental Care for ChildrenChild, OrphanedTherapeutic EquivalencyParentsPatient ComplianceTime FactorsAdrenergic beta-2 Receptor AgonistsDrug Therapy, CombinationChild Nutrition DisordersChild LanguageChild Nutritional Physiological PhenomenaCholinergic AntagonistsQuestionnairesRespiratory Function TestsAge FactorsCross-Sectional StudiesChild MortalityMaximal Expiratory Flow RateAdministration, Oral