1. Department of Oncology, Radiation Oncology, University of Torino, Turin, Italy
2. Radiation Oncology Department, Center Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland
3. Radiotherapy Department, Tecnologie Avanzate Department, Azienda Ospedaliera “Arcispedale Santa Maria Nuova”, IRCCS, Reggio Emilia
4. Radiation Oncology, Ospedale Sacro Cuore-Don Calabria, Negrar (Verona)
5. Radiotherapy Institute, Università Cattolica del Sacro Cuore, Rome
6. Proton Therapy Center, Trento Hospital, Trento
7. Neurosurgery Department, Radiotherapy Unit, Neurological Institute Carlo Besta Foundation, Milan
8. Department of Oncology, Radiation Oncology, AOU Careggi, Florence
9. Department of Radio-Oncology, IRCCS AOU San Martino IST, National Institute for Cancer Research, Genoa
10. Radiotherapy Unit, Campus Biomedico University, Rome
11. Radiotherapy and Radiosurgery Department, Humanitas Clinical and Research Center, Rozzano (MI)
12. Advanced Radiotherapy Center, European Institute of Oncology, Milan
13. Radiotherapy Department, ARNAS Civico Hospital, Palermo
14. Radiation Oncology Department, AOU Policlinico of Modena, Modena
15. Department of Radiation Oncology, Centro di Riferimento Oncologico of Aviano, Pordenone, Italy