1. Department of Primary and Community Care, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
2. Department of Primary and Community Care, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
3. Netherlands Institute for Health Services Research (NIVEL), Utrecht, The Netherlands
4. Faculty of Health and Social Sciences, University of South-Eastern Norway, Drammen, Norway