1 Department of Experimental and Clinical Biomedical Sciences "M. Serio", University of Florence, Florence, Italy; Radiation Oncology Unit, Oncology Department, Azienda Ospedaliero-Universitaria Careggi, Florence, Italy.
2 Radiation Oncology Unit, National Cancer Institute of Milan, Milan, Italy.
3 Radiotherapy and Radiosurgery Department, Humanitas Cancer Center and Research Hospital, Rozzano, Italy.
4 Department of Oncology - Radiation Oncology, University of Turin, Turin, Italy.
5 Radiation Oncology Unit, Oncology Institute, Rambam Medical Center, Haifa, Israel.
6 University Hospital of Modena, Radiation Oncology Unit, Modena, Italy.
7 Radiation Oncology Unit, ASST Valcamonica, Esine, Brescia, Italy.