Couch, A H A 12-month double-blind clinical comparison of betamethasone valerate and sodium chromoglycate in the treatment of asthma. [electronic resource] - The Practitioner Nov 1977 - 751-4 p. digital Publication Type: Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article; Randomized Controlled Trial ISSN: 0032-6518 Subjects--Topical Terms: AdultAgedAsthma--drug therapyBetamethasone--analogs & derivativesBetamethasone Valerate--therapeutic useClinical Trials as TopicCromolyn Sodium--therapeutic useDouble-Blind MethodFemaleHumansMaleMiddle AgedTime Factors