Administration, Inhalation Adrenal Cortex Hormones Adrenergic beta-Agonists Adult Asthma Child Data Collection Humans Physicians Steroids Treatment adolescent adult article asthma beta adrenergic receptor stimulating agent child corticosteroid cromoglycate disodium desensitization drug choice health survey human information processing inhalational drug administration maintenance therapy major clinical study medical practice medical specialist nebulization