1. Division of Radiation Oncology, Istituto Europeo di Oncologia, Milano, Italy;
2. Division of Radiotherapy, Istituto Nazionale per lo Studio e la Cura dei Tumori, Fondazione G. Pascale IRCCS, Napoli, Italy;
3. Department of Radiation Oncology, S. Camillo-Forlanini Hospital, Roma, Italy;
4. Department of Internal Medicine, Radiotherapy Institute, Ospedali Riuniti Umberto I, G.M. Lancisi, G. Salesi, Ancona, Italy;
5. Radiotherapy and Radiosurgery Department, Humanitas Cancer Centre and Research Hospital, Milano, Italy;
6. Radiotherapy Unit 1, National Cancer Institute of Milan, Milano, Italy;
7. Radiotherapy Unit, Fondazione Poliambulanza, Brescia, Italy;
8. Department of Radiotherapy, Campus Bio-Medico University, Roma, Italy;
9. Radiotherapy Department, Ivrea Community Hospital, Ivrea, Italy; Radiation Oncology Department, Tomotherapy Unit, Ospedale Regionale ‘U. Parini’, AUSL Valle d'Aosta, Aosta, Italy;
10. REM Radioterapia, Istituto Oncologico del Mediterraneo (IOM), Catania, Italy;
11. Department of Radiation Oncology, Fondazione Salvatore Maugeri, Pavia, Italy;
12. Radiation Oncology Section, University of Perugia and Perugia General Hospital, Perugia, Italy;
13. Radiotherapy Unit, Azienda Sanitaria 10, Firenze, Italy;
14. Radiotherapy Unit, Ospedale Fatebenefratelli Isola Tiberina, Roma, Italy;
15. Department of Radiotherapy, Azienda Sanitaria Universitaria Integrata Santa Maria della Misericordia, Udine, Italy;
16. Department of Oncology and Hemato-oncology, University of Milan, Milano, Italy
17. Scientific Directorate, European Institute of Oncology, Milano, Italy;