ChlorofluorocarbonsAlbuterolMetered Dose InhalersDry Powder InhalersNebulizers and VaporizersAerosol PropellantsAdministration, InhalationPowdersBronchodilator AgentsHydrocarbons, FluorinatedBeclomethasoneAnti-Asthmatic AgentsAerosolsAsthmaInhalation SpacersBudesonideIpratropiumEthanolaminesEquipment DesignPregnadienediolsFenoterolTerbutalineRespiratory System AgentsForced Expiratory VolumeAsperger SyndromeCross-Over StudiesRespiratory TherapyPulmonary Disease, Chronic Obstructive