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Farstad IN, Norstein J, Brandtzaeg P.Farstad IN, et al. Among authors: norstein j.Gastroenterology. 1997 Jan;112(1):163-73. doi: 10.1016/s0016-5085(97)70231-2.Gastroenterology. 1997.PMID: 8978355
Sudmann A, Skarre E, Talleraas O, Norstein J.Sudmann A, et al. Among authors: norstein j.Tidsskr Nor Laegeforen. 2005 Mar 3;125(5):556-9.Tidsskr Nor Laegeforen. 2005.PMID: 15776025Free article.Norwegian.