1. Dipartimento di Gastroenterologia–UO Gastroenterologia e Malattie del Ricambio, Azienda Ospedaliero Universitaria Pisana, Ospedale Cisanello Via Paradisa 2, 56124 Pisa, Italy
2. Istituto Oncologico Bari, Bari, Italy
3. Campus Biomedico Roma, Rome, Italy
4. Istituto Oncologico Veneto, Padoa, Italy
5. Private practice, Brescia, Italy
6. Section of Gastroenterology, DIBIMIS, University of Palermo, Palermo, Italy