Haahtela, T Hyposensitization in hay fever with grass pollen extracts: a three-year study comparing a dialysed alum adsorbed extract with allpyral. [electronic resource] - Annals of allergy May 1984 - 355-62 p. digital Publication Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial ISSN: 0003-4738 Subjects--Topical Terms: AdolescentAdultDesensitization, ImmunologicFemaleHumansImmunotherapyMaleMiddle AgedPhytotherapyPlant Extracts--therapeutic usePollen--therapeutic useRhinitis, Allergic, Seasonal--immunology