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Oxford University Press‎(2006)‎

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By Lagerlund M.   Hedin A.   Sparén P.   Thurfjell E.   Lambe M.   in Preventive Medicine

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Academic Press‎(2000)‎

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By Stefánsson T.   Ekbom A.   Sparèn P.   Påhlman L.   in Scandinavian Journal of Gastroenterology

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Informa Healthcare‎(2004)‎

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