605,807 EKBOM ANDERS Inflammatory bowel disease : occurrence, causation and cancer risk : [doctoral thesis] / Anders Ekbom ; Uppsala University. - Uppsala : Academiae Ubsaliensis, 1990. - 42 s. ; 25 cm (Acta Universitatis Upsaliensis : Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 0282-7476 ; 277)