1. Department of Primary and Community Care, Radboud university medical center, Nijmegen, The Netherlands
2. Department of Family Medicine, Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, The Netherlands
3. Department of General Practice, Erasmus University Medical Center, Rotterdam, The Netherlands
4. Nivel (Netherlands Institute for Health Services Research), Utrecht, the Netherlands
5. Faculty of Caring Science, Work Life and Social Welfare, University of Borås, Borås, Sweden