1. Department of Oncology, KU Leuven, 3000 Leuven, Belgium
2. Research Department, Belgian Cancer Registry, 1210 Brussels, Belgium
3. Department of Medical Oncology, Oncologisch Centrum, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, 1090 Brussels, Belgium
4. Division of Medical Oncology, Kortrijk Cancer Centre, AZ Groeninge, 8500 Kortrijk, Belgium
5. School of Life Sciences, Medical Technology Research Centre (MTRC), Anglia Ruskin University, Cambridge CB1 1PT, UK
6. School of Nursing & Midwifery, University of Plymouth, Plymouth PL4 8AA, UK
7. Department of Geriatric Medicine, Iridium Cancer Network Antwerp, Sint-Augustinus, 2610 Wilrijk, Belgium
8. Department of Hematology, ULB—Institute Jules Bordet, 1070 Brussels, Belgium
9. Department of Medical Oncology, Cliniques Universitaires Saint-Luc—UCLouvain, 1200 Brussels, Belgium
10. Department Medical Oncology, University Hospital Erasme, Université Libre de Bruxelles ULB, 1000 Brussels, Belgium
11. Department of Oncology, Groupe Santé CHC-Liège, Clinique CHC-MontLégia, 4000 Liège, Belgium
12. Department of Medical Oncology, GHDC Grand Hôpital de Charleroi, 6000 Charleroi, Belgium
13. Department of Geriatric Medicine, Centre Hospitalier de Mouscron, 7700 Mouscron, Belgium
14. Department of Medical Oncology, AZ Klina, 2930 Brasschaat, Belgium
15. Department of Medical Oncology, Imelda Hospital, 2820 Bonheiden, Belgium
16. Department of Medical Oncology, CHU-UCL-Namur, 5530 Namur, Belgium
17. Department Medical Oncology, ZNA Stuivenberg, 2060 Antwerp, Belgium
18. Department of Medical Oncology, Centre Hospitalier Universitaire Sart Tilman, Liège University, 4000 Liège, Belgium
19. Department of Medical Oncology, ZNA Middelheim, 2020 Antwerp, Belgium
20. Department of Medical Oncology, Centre Hospitalier Jolimont, 7100 La Louvière, Belgium
21. Department of Medical Oncology, University Hospital Antwerp, 2650 Edegem, Belgium
22. Department of Geriatric Medicine, CHU St-Pierre, Free Universities Brussels, 1000 Brussels, Belgium
23. Department of Medical Oncology, AZ Vesalius, 3700 Tongeren, Belgium
24. Academic Centre for Nursing and Midwifery, Department of Public Health and Primary Care, KU Leuven, 3000 Leuven, Belgium
25. Department of Geriatric Medicine, University Hospitals Leuven, 3000 Leuven, Belgium
26. Gerontology and Geriatrics, Department of Public Health and Primary Care, KU Leuven, 3000 Leuven, Belgium
27. Department of General Medical Oncology, University Hospitals Leuven, 3000 Leuven, Belgium