1 Gastroenterology and Endoscopy Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy; Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
2 Department of Gastroenterology, University College London Hospital [UCLH], London, United Kingdom
3 Gastroenterology and Endoscopy Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy; Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy. leonardo.eusebi@unibo.it