J Bilsen1, L Robijn2, K Chambaere3, J Cohen3, L Deliens4. 1. Mental Health and Wellbeing Research Group, Department of Health Sciences, Vrije Universiteit Brussel (VUB), Brussels, Belgium. 2. End-of-life Care Research Group, Vrije Universiteit Brussel (VUB) & Ghent University, Brussels, Belgium. Electronic address: lenzo.robijn@vub.ac.be. 3. End-of-life Care Research Group, Vrije Universiteit Brussel (VUB) & Ghent University, Brussels, Belgium. 4. End-of-life Care Research Group, Vrije Universiteit Brussel (VUB) & Ghent University, Brussels, Belgium; Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Centre, Amsterdam, The Netherlands.