1. Department of Applied Health Sciences, Azienda di Servizi alla Persona (ASP) di Pavia, University of Pavia, Pavia, Italy
2. Department of Gastroenterology, Policlinico di Monza, Monza, Italy and Centro Diagnostico Italiano, Milan, Italy
3. Castellazzi Department of Clinical Surgical Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy