1. Department of Radiation Oncology, Liege University Hospital, CHU Liège, Domaine universitaire du Sart Tilman B35 Avenue de l’Hôpital, Liège 14000, Belgium
2. Department of Medico-Economic Information, Liege University Hospital, CHU Liège, Domaine universitaire du Sart Tilman B35 Avenue de l’Hôpital, Liège 14000, Belgium
3. Department of STA Quality, Liege University Hospital, CHU Liège, Domaine universitaire du Sart Tilman B35 Avenue de l’Hôpital, Liège 14000, Belgium