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Tveit KM, Karlsen KO, Fosså SD, Flokkmann A, Guldvog I, Haffner J.Tveit KM, et al.Scand J Gastroenterol. 1989 Dec;24(10):1243-7. doi: 10.3109/00365528909090794.Scand J Gastroenterol. 1989.PMID: 2513640
Tveit KM, Guldvog I, Hagen S, Trondsen E, Harbitz T, Nygaard K, Nilsen JB, Wist E, Hannisdal E.Tveit KM, et al.Br J Surg. 1997 Aug;84(8):1130-5.Br J Surg. 1997.PMID: 9278661Clinical Trial.