1 Department of Medicine, Inflammatory Bowel Disease Unit, A.O.O.R., 'Villa Sofia-Cervello' Hospital.
2 Department of Health Promotion Sciences Maternal and Infant Care, Section of Gastroenterology and Hepatology, Internal Medicine and Medical Specialties, PROMISE, University of Palermo, Palermo.
3 Department of Gastroenterology and Digestive Endoscopy, Section of Gastroenterology, 'S. Elia-Raimondi' Hospital, Caltanissetta, Italy.