1. The EMGO Institute for Health & Care Research (EMGO+), Department of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands.
2. Palliative Care Center of Expertise, Amsterdam, The Netherlands.
3. NIVEL, Netherlands Institute for Health Services Research, Utrecht, The Netherlands.
4. End-of-Life Care Research Group, Vrije Universiteit Brussel, Brussels, Belgium.
5. Department of General Practice, Vrije Universiteit Brussel, Brussels, Belgium.