1. General Surgery Unit, Department of Surgery, University of Pisa, Pisa, Italy.
2. General Surgery Unit, Department of Surgery, Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy.
3. Multidisciplinary Robotic Center, Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy.
4. EndoCAS (Center for Computer Assisted Surgery), University of Pisa, Pisa, Italy.