1. Department of Oncology, Azienda Sanitaria Universitaria Friuli Centrale (ASUFC), 33100 Udine, Italy
2. Department of Medicine (DAME), University of Udine, 33100 Udine, Italy
3. Institute of Radiology, Department of Medicine (DAME), University of Udine, 33100 Udine, Italy
4. Department of Radiation Oncology (Maastro), GROW School for Oncology and Reproduction, Maastricht University Medical Centre, 6229 ET Maastricht, The Netherlands