1. Department of Primary and Community care, Radboud Institute of Health Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
2. USUMA Markt- und Sozialforschung GmbH, Berlin, Germany
3. Scientific Institute for Quality of Healthcare, Radboud Institute of Health Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
4. Department for Health Evidence, Radboud Institute of Health Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands