1. WHO Collaborating Centre, Department of Primary Care and Public Health, Imperial College London, London, UK
2. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
3. Institute of General Practice and Evidence-based Health Service Research, Medical University of Graz, Graz, Austria
4. Department of Public Health, Amsterdam UMC, University of Amsterdam; and Amsterdam Public Health Research Institute, Amsterdam, Netherlands
5. Department of Primary and Community Health, Radboud University Medical Center, Nijmegen, The Netherlands
6. Department of Health Services Research and Policy, Australian National University, Canberra, Australia