1 Department of Medical Oncology, Oncologisch Centrum, UZ Brussel, Laarbeeklaan 101, 1090 Brussel, Belgium. Electronic address: Lore.decoster@uzbrussel.be.
2 Department of General Medical Oncology and Geriatric Medicine, University Hospitals Leuven, Leuven, Belgium.
3 Department of General Medical Oncology, University Hospitals Leuven, Leuven, Belgium.