[1] Haukeland Hosp, Dept Oncol, Bergen, Norway
[2] Univ Copenhagen, Rigshosp, Dept Surg & Endocrinol PE C, Copenhagen, Denmark
[3] Uppsala Univ, Dept Med Sci 3, Uppsala, Sweden
[4] Odense Univ Hosp, Dept Oncol, Odense, Denmark
[5] Oslo Univ Hosp, Rikshosp, Dept Hepatopancreatobiliary Surg 5, Oslo, Norway
[6] Aarhus Univ Hosp, Dept Oncol, Aarhus, Denmark
[7] Univ Copenhagen, Rigshosp, Dept Oncol 7, Copenhagen, Denmark
[8] Aarhus Univ Hosp, Dept Hepatol & Gastroenterol 8, Aarhus, Denmark
[9] Univ Helsinki, Cent Hosp, Dept Oncol 9, Helsinki, Finland
[10] Oslo Univ Hosp, Dept Oncol, Oslo, Norway
[11] Haukeland Hosp, Ctr Clin Res 11, Bergen, Norway
[12] MSKCC, Dept Pathol, New York, NY USA
[13] Univ Bern, Dept Pathol, Bern, Switzerland
[14] Univ Bergen, Dept Clin Sci, Bergen, Norway