[1] St Jansdal Hosp, Dept Surg, POB 140, NL-3840 AC Harderwijk, Netherlands
[2] Radboud Univ Nijmegen, Med Ctr, Dept Surg, NL-6525 ED Nijmegen, Netherlands
[3] Erasmus MC, Dept Surg, Rotterdam, Netherlands
[4] Med Ctr Leeuwarden, Dept Surg, Leeuwarden, Netherlands