1 Unit of Diagnostic Imaging, Department of Radiological Sciences, Azienda Ospedaliero-Universitaria Senese, "Santa Maria alle Scotte" General Hospital, Viale Mario Bracci, 16, 53100, Siena, Tuscany, Italy. guerrinisus@gmail.com.
2 Scleroderma Unit, Department of Medical, Surgical and Neuro Sciences, University of Siena, Siena, Italy.
3 Unit of Diagnostic Imaging, Department of Medical, Surgical and Neuro Sciences and of Radiological Sciences, University of Siena, Azienda Ospedaliero-Universitaria Senese, Siena, Italy.
4 Unit of Rheumatology, Department of Medical, Surgical and Neuro Sciences, University of Siena, Azienda Ospedaliero-Universitaria Senese, Siena, Italy.