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Tveit KM, Karlsen KO, Fosså SD, Flokkmann A, Guldvog I, Haffner J.Tveit KM, et al. Among authors: haffner j.Scand J Gastroenterol. 1989 Dec;24(10):1243-7. doi: 10.3109/00365528909090794.Scand J Gastroenterol. 1989.PMID: 2513640
Haffner J, Nygaard K.Haffner J, et al.Tidsskr Nor Laegeforen. 1981 Mar 30;101(9-10):570-2.Tidsskr Nor Laegeforen. 1981.PMID: 6784265Norwegian.No abstract available.