[1] Univ Oslo, Rikshosp, Oslo Univ Hosp, Intervent Ctr, N-0027 Oslo, Norway
[2] Univ Oslo, Inst Clin Res, Fac Med, N-0318 Oslo, Norway
[3] Yerevan State Med Univ M Heratsi, Dept Surg 1, Yerevan 0025, Armenia
[4] Akershus Univ Hosp, Dept Gastrointestinal Surg, N-1478 Lorenskog, Norway
[5] Natl Hosp Norway, Oslo Univ Hosp, Dept HPB Surg, N-0407 Oslo, Norway
[6] Univ Oslo, Rikshosp, Oslo Univ Hosp, Dept Radiol, N-0027 Oslo, Norway
[7] Natl Hosp Norway, Oslo Univ Hosp, Dept Transplantat Med, N-0424 Oslo, Norway