Letters to the editor: ragweed treatment problems.
D001249:Asthma / Q000209:etiology / Q000628:therapy*; D002648:Child; D003888:Desensitization, Immunologic; D006801:Humans; D008297:Male; D011058:Pollen; D006255:Rhinitis, Allergic, Seasonal / Q000628:therapy*; D012621:Seasons