1. Belgian Health Care Knowledge Centre (KCE) Brussels Belgium
2. Belgian Cancer Registry Brussels Belgium
3. CHU‐UCL‐Namur Department of radiation oncology Université Catholique de Louvain Namur Belgium
4. Department of Radiotherapy‐Oncology KU Leuven University Hospitals Leuven University of Leuven Leuven Belgium
5. Department of Medical Oncology Antwerp University Hospital Edegem Belgium
6. Faculty of Medicine and Health Sciences University of Antwerp Antwerp Belgium
7. Department of Radiation Oncology Centre Léon Bérard Lyon France