[1] Karolinska Univ Hosp, HPB Dis Unit, Div Surg, S-17176 Stockholm, Sweden
[2] Karolinska Inst, S-17176 Stockholm, Sweden
[3] Karolinska Inst, CLINTEC, Stockholm, Sweden
[4] Karolinska Univ Hosp, Endoscopy Unit, Stockholm, Sweden
[5] Univ Colorado, Dept Surg, Div Surg Oncol, Anschutz Med Campus, Aurora, CO USA