1. Gastroenterology Unit, Department of Medical Specialties, University of Modena & Reggio Emilia, 41100 Modena, Italy
2. Clinical and Experimental Medicine PhD Program, University of Modena & Reggio Emilia, 41100 Modena, Italy
3. Section of Gastroenterology and Hepatology, Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, 90127 Palermo, Italy