1. Department of Radiotherapy, Policlinico Umberto I, “Sapienza” University of Rome, Rome, Italy
2. Department of Woman and Child Sciences, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Catholic University of the Sacred Heart, Rome, Italy
3. Radiation Oncology Clinical Department, National Center for Oncological Hadrontherapy, Pavia, Italy
4. Department of Radiation Oncology, San Giovanni-Addolorata Hospital, Rome, Italy