[1] Franciscus Gasthuis & Vlietland, Dept Surg, Rotterdam, Netherlands
[2] Catharina Hosp, Dept Surg, Michelangelolaan 2, NL-5623 EJ Eindhoven, Netherlands
[3] Dept Anesthesiol, Eindhoven, Netherlands
[4] Catharina Hosp, Dept Surg, Eindhoven, Netherlands