Niccolò Furbetta1, Matteo Bianchini2, Matteo Palmeri2, Luca Morelli2,3. 1. Department of Surgery, Translational and new Technologies in Medicine, University of Pisa, Pisa, Italy. n.furbetta@hotmail.it. 2. Department of Surgery, Translational and new Technologies in Medicine, University of Pisa, Pisa, Italy. 3. EndoCAS (Center for Computer Assisted Surgery), University of Pisa, Pisa, Italy.