1. Department of Geriatric Medicine; University Hospitals Leuven; Leuven Belgium
2. Faculty of Medicine; KU Leuven; Leuven Belgium
3. Department of Abdominal Surgery; University Hospitals Leuven; Leuven Belgium
4. Department of Clinical and Experimental Medicine; KU Leuven; Leuven Belgium
5. Department of Public Health and Primary Care; Academic Centre for Nursing and Midwifery; KU Leuven; Leuven Belgium
6. Statistics; Beernem Belgium
7. Department of Oncology; KU Leuven; Leuven Belgium
8. Department of General Medical Oncology; University Hospitals Leuven; Leuven Belgium