1. Netherlands Institute of Health Services Research (NIVEL), Utrecht, The Netherlands
2. Department of General Practice and Elderly Care Medicine, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands
3. Expertise Center for Palliative Care, VU University Medical Center, Amsterdam, The Netherlands
4. Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands