1. Department of Intensive Care, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands.
2. Scientific Center for Quality of Healthcare, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands.
3. Centre of Expertise on Quality and Safety, University Medical Centre Groningen, Groningen, The Netherlands.
4. Department of Quality and Safety, Rijnstate Hospital, Arnhem, The Netherlands.