1. Medical Oncology Unit B, Department of Radiology, Oncology and Pathology, Policlinico Umberto I, Sapienza University of Rome, 00161 Rome, Italy
2. Medical Oncology Department, Hospital Universitario 12 de Octubre, Instituto de Investigación i+12, 28041 Madrid, Spain
3. Department of Biostatistics Unit, IRCCS—Regina Elena National Cancer Institute, 00144 Rome, Italy
4. Medical Oncology Unit A, Department of Radiology, Oncology and Pathology, Policlinico Umberto I, Sapienza University of Rome, 00161 Rome, Italy