1. End-of-Life Care Research Group, Vrije Universiteit Brussel and Ghent University, Brussels, Belgium
2. Department of Family Medicine, Vrije Universiteit Brussel, Brussels, Belgium
3. EMGO Institute for Health and Care Research and Expertise Center for Palliative Care, Department of General Practice & Elderly Care Medicine, VU University Medical Center, Amsterdam, The Netherlands
4. Heymans Institute of Pharmacology, Ghent University, Ghent, Belgium
5. EMGO Institute for Health and Care Research and Expertise Center for Palliative Care, Department of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands