FUT2 and FUT3 genotype determines CA19-9 cut-off values for detection of cholangiocarcinoma in patients with primary sclerosing cholangitis - Wannhoff, Andreas; Rupp, Christian; Friedrich, Kilian; Weiss, Karl Heinz; Sauer, Peter; Schirmacher, Peter; Stremmel, Wolfgang; Gotthardt, Daniel (Journal of hepatology, 2013)