[1] Univ Milan, Dept Radiat Oncol, European Inst Oncol, Milan, Italy
[2] European Inst Oncol, Dept Radiat Oncol, Milan, Italy
[3] European Inst Oncol, Dept Epidemiol & Stat, Milan, Italy
[4] European Inst Oncol, Unit Med Phys, Milan, Italy
[5] European Inst Oncol, Dept Urol, Milan, Italy
[6] European Inst Oncol, Dept Med Oncol, Div Urogenital & Head & Neck Tumours, Milan, Italy
[7] Ghent Univ Hosp, Dept Radiat Oncol, Ghent, Belgium
[8] Univ Milan, European Inst Oncol, Dept Med Imaging & Radiat Sci, Milan, Italy