N De Hous1,2, C de Gheldere3, S Van den Broeck4, N Komen4. 1. Department of Abdominal Surgery, H.-Hartziekenhuis, Lier, Belgium. nicolas.dehous@hotmail.com. 2. Department of Abdominal Surgery, University Hospital of Antwerp, Edegem, Belgium. nicolas.dehous@hotmail.com. 3. Department of Abdominal Surgery, H.-Hartziekenhuis, Lier, Belgium. 4. Department of Abdominal Surgery, University Hospital of Antwerp, Edegem, Belgium.