1. a Department of Otolaryngology and Head and Neck Surgery, Antwerp University Hospital, Edegem, Antwerp, Belgium
2. e Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
3. b Department of Medical Oncology, Antwerp University Hospital, Edegem, Antwerp, Belgium
4. c Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, Czech Republic
5. d School of Medicine, Masaryk University, Brno, Czech Republic
6. f Department of Oncology, Santa Croce e Carle General Hospital, Cuneo, Italy
7. g Department of Oncology, San Paolo Hospital, Savona, Italy
8. h Department of Radiotherapy, Institut Jules Bordet, Université Libre de Bruxelles, Brussels, Belgium
9. i Scientific Coordination and Biostatistics, Antwerp University Hospital, Edegem, Antwerp, Belgium
10. j Department of Radiotherapy, Ziekenhuis Netwerk Antwerpen (ZNA), Antwerp, Belgium