1. End-of-Life Care Research Group, Vrije Universiteit Brussel, Brussels, Belgium.
2. Heymans Institute for Pharmacology, Ghent University, Ghent, Belgium.
3. Bioethics Institute Ghent, Ghent University, Ghent, Belgium.
4. Department of Epidemiology, Scientific Institute of Public Health, Brussels, Belgium.
5. Department of Medical Oncology, University Hospital Brussels, Brussels, Belgium.
6. Department of Pulmonary Medicine, Antwerp University Hospital, Edegem, Belgium.
7. Department of Pulmonary Medicine, ZNA Middelheim Hospital, Antwerp, Belgium.
8. Department of Pulmonary Medicine, Hospital Sint-Augustinus, Wilrijk, Belgium.
9. Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Centre, Amsterdam, the Netherlands.