title: Letter: Cromolyn vs placebo.
mesh_terms: D001249:Asthma / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004205:Cromolyn Sodium / Q000627:therapeutic use*; D004341:Drug Evaluation; D006801:Humans; D010919:Placebos
chemical_list: D010919:Placebos; D004205:Cromolyn Sodium