1. Department of New Technologies and Translational Research in Medicine and Surgery, Gastroenterology Unit, University of Pisa, Via Roma 67, 56122 Pisa, Italy
2. Department of New Technologies and Translational Research in Medicine and Surgery, Nuclear Medicine Unit, University of Pisa, Via Roma 67, 56122 Pisa, Italy
3. Department of General Surgery and Gastroenterology, Gastroenterology Unit, Az. Ospedaliero Universitaria Pisana, Via Paradisa 2, 56124 Pisa, Italy