[1] Norwegian Univ Sci & Technol NTNU, Dept Canc Res & Mol Med, Trondheim, Norway
[2] St Olavs Hosp, Dept Surg, Trondheim, Norway
[3] Columbia Univ Coll Phys & Surg, Div Digest & Liver Dis, New York, NY 10032 USA
[4] NTNU, Dept Circulat & Med Imaging, Trondheim, Norway