[1] Parini Hosp, Radiotherapy Unit, Viale Ginevra 3, I-11100 Aosta, Italy
[2] State Hosp Mater Salutis AULSS 9, Dept Radiat Oncol & Nucl Med, Via Carlo Gianella 1, I-37045 Legnago, VR, Italy
[3] Univ G dAnnunzio, SS Annunziata Hosp, Radiat Oncol Unit, Via Vestini, I-66100 Chieti, Italy
[4] Univ Cattolica Sacro Cuore, Fdn Policlin Univ A Gemelli, Dept Radiol Radiotherapy & Hematol Sci, Via Pineta Sacchetti 217, I-00168 Rome, Italy
[5] APSS, Proton Therapy Unit, Dept Oncol, Via Alcide Degasperi 79, I-38123 Trento, Italy
[6] Policlin S Gerardo, Dept Radiat Oncol, Via Sansovino 4, I-20133 Milan, Italy
[7] Univ Milano Bicocca, Via Sansovino 4, I-20133 Milan, Italy
[8] S Maria Hosp, Radiotherapy Oncol Ctr, Viale Tristano Joannuccio, I-05100 Terni, Italy
[9] Univ Hosp G Martino, Dept Image Diagnost, Operat Unit Radiat Oncol, Messina, Italy
[10] Azienda Osped San Camillo Forlanini, Radiat Oncol, Circonvallaz Gianicolense 87, I-00152 Rome, Italy