1. Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
2. General Surgery Unit, Ospedale Versilia, Azienda USL Toscana Nordovest, Italy
3. Division of Diagnostic and Interventional Ultrasound in Transplantations, Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy