1. Department of Primary and Community Care, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
2. Department of Primary and Community Care, Scientific Institute for Quality of Healthcare, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
3. Section of Ethics, Philosophy and History of Medicine, Scientific Institute for Quality of Healthcare, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
4. Department of Primary Care and Public Health, Cardiff University, Cardiff, UK
5. Department of Anaesthesiology, Pain and Palliative Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands