[1] Rigshosp, Juliane Marie Ctr, Sect Surg Pathophysiol, DK-2100 Copenhagen, Denmark
[2] Hvidovre Univ Hosp, Dept Surg Gastroenterol, DK-2650 Hvidovre, Denmark
[3] Gentofte Univ Hosp, Dept Surg Gastroenterol, Hellerup, Denmark
[4] Hvidovre Univ Hosp, Unit Med Technol Assessment, DK-2650 Hvidovre, Denmark