1. Department of Oncology, San Camillo de Lellis Hospital, Rieti, Italy
2. Department of Oncology, Santa Maria della Misericordia Hospital, Azienda Ospedaliera di Perugia, Perugia, Italy
3. Biostatistic Unit, IRCSS Regina Elena National Cancer Institute, Rome, Italy
4. Division of Medical Oncology 1, IRCSS Regina Elena National Cancer Institute, Rome, Italy
5. Department of Oncology, University of Rome "Sapienza," Rome, Italy
6. Department of Oncology, Belcolle Hospital–Viterbo, Viterbo, Italy
7. Department of Oncology, Misericordia Hospital, Grosseto, Italy
8. Department of Radiotherapy, San Camillo de Lellis Hospital, Rieti, Lazio, Italy
9. Department of Oncology, Belcolle Hospital–AUSL–Viterbo, Viterbo, Italy
10. Division of Medical Oncology 1, Regina Elena National Cancer Institute, Rome, Italy
11. Department of Clinical and Molecular Medicine, La Sapienza University, Rome, Italy
12. Medical Oncology Unit, Policlinico Umberto I, Rome, Italy
13. Department of Medical Oncology, Santa Maria della Misericordia Hospital, Azienda Ospedaliera di Perugia, Perugia, Italy
14. Division of Oncology, Integrated University Hospital of Verona, Verona, Italy