Hinuma K, Murphy GM, Dowling RH. Recurrent urticaria and reduced diamine oxidase activity. Clin Exp Allergy 1990;20:373-6. Medline 61. Lassen LH, Heinig JH, Oestergaard S, Olesen J. Histamine inhalation is a specific but insensitive laboratory test for migraine. Cephalalgia 1996;16:550-3. Abstract/FREE