1 Department of Medicine, Surgery and Neuroscience, Unit of Diagnostic Imaging, Azienda Ospedaliera Universitaria Senese, University of Siena, Siena, Italy.
2 Unit of Radiation Oncology, Azienda Ospedaliera Universitaria Senese, Siena, Italy.
3 Department of Medicine, Surgery and Neuroscience, Unit of General Surgery and Surgical Oncology, University of Siena, Siena, Italy.