Metered Dose InhalersNebulizers and VaporizersDry Powder InhalersAdministration, InhalationChlorofluorocarbonsAerosol PropellantsBronchodilator AgentsPowdersAlbuterolAerosolsBeclomethasoneInhalation SpacersFenoterolAsthmaIpratropiumAnti-Asthmatic AgentsHydrocarbons, FluorinatedBudesonideTerbutalineRespiratory System AgentsEquipment DesignEthanolaminesPregnenedionesForced Expiratory VolumeChlorofluorocarbons, MethaneCross-Over StudiesDouble-Blind MethodHoarsenessPeak Expiratory Flow RateAndrostadienesAtropine DerivativesParticle SizeCromolyn SodiumAdrenergic beta-AgonistsPregnadienediolsPulmonary Disease, Chronic ObstructiveDrug Delivery SystemsRespiratory TherapyLung Diseases, ObstructiveChemistry, PharmaceuticalTechnetiumTechnology, PharmaceuticalLungBiological AvailabilityGlucocorticoidsTreatment OutcomeScopolamine DerivativesAdrenal Cortex HormonesVital CapacityDrug Administration SchedulePatient Education as TopicAnti-Inflammatory AgentsDrug CombinationsHydrocortisoneTherapeutic EquivalencyAdrenergic beta-2 Receptor AgonistsPatient ComplianceCholinergic AntagonistsDose-Response Relationship, DrugInspiratory CapacityMaximal Expiratory Flow RateBronchiSelf AdministrationRespiratory Function TestsPatient PreferenceOzone DepletionDrug Therapy, CombinationMedication AdherenceBronchial SpasmTime FactorsInhalation