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Risk factors for extensive ulcerative colitis and ulcerative proctitis: a population based case-control study.
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    Samuelsson SM, Ekbom A, Zack M, et al
    Risk factors for extensive ulcerative colitis and ulcerative proctitis: a population based case-control study.

    Publication history

    • First published December 1, 1991.
    Online issue publication 
    December 01, 1991

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