By Ytrebø L. M.   Nedredal G. I.   Langbakk B.   in Scandinavian Journal of Gastroenterology

ISSN:0036-5521|37|9|1077-1088

Informa Healthcare‎(2002)‎

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By Nygaard Ø   Langbakk B   Romner B   in Scandinavian Journal of Clinical and Laboratory Investigation

ISSN:0036-5513|58|3|183-186

Informa Healthcare‎(1998)‎

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