1 Gastroenterology and Digestive Endoscopy Unit, Azienda USL di Modena, Via Molinari 2, 41012 Carpi (MO), Italy. Electronic address: p.biancheri@ausl.mo.it.
2 Gastroenterology and Digestive Endoscopy Unit, Azienda USL di Modena, Via Molinari 2, 41012 Carpi (MO), Italy.