1 Department of Gastroenterology, Endoscopy Unit, Hospital of The Ministry of Interior and Administration, Szczecin, Poland.
2 Division of Gastroenterology, St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada; Li Ka Shing Knowledge Institute, Toronto, Ontario, Canada.
3 Department of Gastroenterology and Hepatology, Radboud University Medical Center, Nijmegen, the Netherlands.
4 Division of Gastroenterology, Duke University Medical Center, Durham, North Carolina.
5 Department of Gastroenterology, Royal Cornwall Hospitals NHS Trust, Truro, United Kingdom; Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom. Electronic address: keithsiau@nhs.net.