1. Radiation Oncology, Policlinico Umberto I, Department of Radiological, Oncological and Pathological Sciences, “Sapienza” University of Rome, Viale Regina Elena 326, 00161 Rome, Italy
2. Operative Research Unit of Radiation Oncology, Fondazione Policlinico Universitario Campus Bio-Medico, Via Álvaro del Portillo, 200, 00128 Rome, Italy
3. Radiation Oncology Unit, Gemelli Molise Hospital, Università Cattolica del Sacro Cuore, Largo Agostino Gemelli, 1, 86100 Campobasso, Italy
4. Department of Radiotherapy, European Institute of Oncology IRCCS, Via Giuseppe Ripamonti, 435, 20141 Milano, Italy
5. Radiation Oncology Section, Perugia General Hospital, Piazzale Giorgio Menghini, 3, 06129 Perugia, Italy
6. Radioterapia Oncologica, Fondazione IRCS, Istituto Nazionale dei Tumori di Milano, Via Giacomo Venezian, 1, 20133 Milano, Italy
7. U.O.C. Radioterapia Oncologica, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Via Giuseppe Moscati, 31, 00168 Rome, Italy
8. Radioterapia Ospedale San Gerardo-ASST Via G. B. Pergolesi, 33, 20900 Monza, Italy
9. Radiotherapy Oncology Centre, S. Maria Hospital, Viale Tristano di Joannuccio, 05100 Terni, Italy
10. Radiation Oncology Unit, “SS Annunziata” Hospital, “G. D’Annunzio” University, Via dei Vestini, 66100 Chieti, Italy
11. Department of Medicine, Surgery and Translational Medicine, “Sapienza” University of Rome, Radiotherapy Oncology, St. Andrea Hospital, Via di Grottarossa 1035, 00189 Rome, Italy