1 Gastroenterology Unit, Department of Internal Medicine, University of Genoa, IRCCS-Ospedale Policlinico San Martino, Viale Benedetto XV, no.6, 16132 Genoa, Italy. Electronic address: egiannini@unige.it.
2 Gastroenterology Unit, Department of Internal Medicine, University of Genoa, IRCCS-Ospedale Policlinico San Martino, Viale Benedetto XV, no.6, 16132 Genoa, Italy.