D P A Versteegden1, M P Buise2, S W Nienhuijs3. 1. Department of Surgery, Catharina Hospital, Michelangelolaan 2, 5623, EJ, Eindhoven, the Netherlands. dirk.versteegden@catharinaziekenhuis.nl. 2. Department of Anesthesiology, Catharina Hospital, Eindhoven, the Netherlands. 3. Department of Surgery, Catharina Hospital, Michelangelolaan 2, 5623, EJ, Eindhoven, the Netherlands.