1. Department of Gastroenterology; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands
2. Department of Epidemiology; Biostatistics and Health Technology Assessment; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands
3. Department of Surgery; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands
4. Department of Operating Rooms/Evidence-based Surgery; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands