1 Digestive Pathophysiology Unit, Azienda Ospedaliero-Universitaria di Modena, Ospedale Civile di Baggiovara, Modena, Italy.
2 Gastroenterology Unit, Department of Medical and Surgical Sciences, IRCCS, Azienda Ospedaliero-Universitaria di Bologna Policlinico S Orsola-Malpighi, Bologna, Italy.
3 Digestive Disease, Università Campus Bio-Medico di Roma Facoltà Dipartimentale di Medicina e Chirurgia, Roma, Italy.
4 Department of New Technologies and Translational Research in Medicine and Surgery, University of Pisa, Pisa, Italy.
5 Gastroenterology Unit, Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy.