1 Gastroenterology Unit, Department of Clinical and Experimental Science, University of Brescia, P.le Spedali Civili 1, I-25121, Vila Europa 11, Brescia, Italy. barbara.zanini@unibs.it.
2 Institute of Pathology Spedali Civili, Piazzale Spedali Civili 1, 25121, Brescia, Italy.