1 Clinical Pharmacology & Digestive Pathophysiology Unit, Department of Clinical & Experimental Medicine, University of Parma, Italy.
2 Service of Digestive Diseases, Clinic Hospital Lozano Blesa, University of Zaragoza, Aragón Institute for Health Research (IIS Aragón), CIBERehd, Zaragoza, Spain.
3 Department of Gastroenterology, King's College Hospital, London, United Kingdom.