1. Department of General Medical Oncology; University Hospitals Leuven; Leuven Belgium
2. Department of Geriatric Medicine; University Hospitals Leuven; Leuven Belgium
3. Department of Medical Oncology; ZNA Middelheim; Antwerp Belgium
4. Department of Medical Oncology, Oncology Center, University Hospital Brussels; Vrije Universiteit Brussel; Brussels Belgium
5. Consultant in Statistics; Beernem Belgium
6. Department of Chronic Diseases, Metabolism, and Aging; Catholic University of Leuven; Leuven Belgium
7. Department of Public Health and Primary Care, Health Services and Nursing Research; Catholic University of Leuven; Leuven Belgium
8. Department of Oncology; Catholic University of Leuven; Leuven Belgium