1. Department of Surgery, Catharina Hospital, Michelangelolaan 2, Eindhoven, The Netherlands
2. Department of Health Services Research, CAPHRI Care and Public Health Research Institute, Maastricht University, Maastricht, The Netherlands
3. Trimbos Institute of Mental Health and Addiction, Utrecht, The Netherlands
4. Department of Surgery, ZGT Hospital Group Twente, Almelo, The Netherlands