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