1. Department of Operating Theatres; Radboud University Medical Centre; Nijmegen the Netherlands
2. Scientific Institute for Quality of Healthcare; Radboud University Medical Centre; Nijmegen the Netherlands
3. Faculty of Industrial Design Engineering; Technical University of Delft; Delft the Netherlands
4. Department of Anaesthesiology; Radboud University Medical Centre; Nijmegen the Netherlands
5. Department of Anaesthesiology; University Medical Centre Groningen; Groningen the Netherlands