title: A statistical review of double-blind studies on ragweed hay fever injection therapy.
mesh_terms: D000941:Antigens / Q000008:administration & dosage*; D002986:Clinical Trials as Topic; D003888:Desensitization, Immunologic; D006801:Humans; D008722:Methods; D010919:Placebos; D010936:Plant Extracts; D006255:Rhinitis, Allergic, Seasonal / Q000188:drug therapy*
chemical_list: D000941:Antigens; D010919:Placebos; D010936:Plant Extracts