1 Academic Department of Gastroenterology, Royal Hallamshire Hospital, Sheffield, UK; Gastroenterology Unit of IRCCS Pavia Institute, Istituti Clinici Scientifici Maugeri, University of Pavia, Italy. . annalisa.schiepatti01@universitadipavia.it.
2 Academic Department of Gastroenterology, Royal Hallamshire Hospital, Sheffield, UK. . david.sanders1@nhs.net.