1. Department of Neuroscience, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
2. Unit of Medical Statistics, Biometry and Bioinformatics, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
3. Unit of Hereditary Digestive Tract Tumors, Department of Surgery, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
4. Department of Morphology, Surgery and Experimental Medicine, University of Ferrara and S. Anna University Hospital of Ferrara, Ferrara, Italy
5. Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
6. Colorectal Surgery Unit, Department of Surgery, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy