1. Department of Primary and Community Care Radboud Institute for Health SciencesRadboud University Medical Center Nijmegen The Netherlands
2. Biometris Wageningen University & Research Wageningen The Netherlands
3. Vektis Healthcare Information Center Zeist The Netherlands
4. Department of Health Services Research and Policy Honorary Professor of Primary Health Care Research Australian National University Canberra Australia
5. Department for Health Evidence Radboud Institute for Health SciencesRadboud University Medical Center Nijmegen The Netherlands