title: Clinical evaluation of desensitization therapy in hay fever.
mesh_terms: D002986:Clinical Trials as Topic; D003888:Desensitization, Immunologic; D004311:Double-Blind Method; D006801:Humans; D010919:Placebos; D006255:Rhinitis, Allergic, Seasonal / Q000628:therapy*
chemical_list: D010919:Placebos