Digestive Endoscopy Unit and Gastroenterology, Fondazione Poliambulanza, Brescia, Italy. Digestive Endoscopy Unit, Fondazione Policlinico Universitario A. Gemelli - IRCCS, Rome, Italy. TAGG Research Centre, Department of Clinical Medicine, Tallaght Hospital, Trinity College Dublin, Ireland. Royal Free Unit for Endoscopy, The Royal Free Hospital and UCL Institute for Liver and Digestive Health, London, UK. Division of Gastroenterology, Shaare Zedek Medical Center, Jerusalem, Israel. Department of Gastroenterology, Hepatology, and Nutrition, UT Health Science Center at Houston/Memorial Hermann, Houston, TX, USA. McGovern Medical School, Department of Internal Medicine, Houston, TX, USA. Department of Gastroenterology, Navarra Hospital Complex, Pamplona, Spain. Department of Gastroenterology and Hepatology, University Hospital Centre, Zagreb, Croatia. Clinic for Internal Medicine, Bethesda Krankenhaus Bergedorf, Hamburg, Germany. Academic Department of Gastroenterology and Hepatology, Sheffield Teaching Hospitals NHS Trust, Sheffield, UK. Gastroenterology and Endoscopy Unit, Hospices Civils de Lyon, Hôpital E. Herriot, Lyon, France. Department of Gastroenterology, South Tyneside NHS Foundation Trust, South Shields, UK. CPO Piemonte, AOU Città della Salute e della Scienza, Turin, Italy. Office of Research and Innovation, Royal College of Surgeons in Ireland Coláiste Ríoga na Máinleá in Éirinn, Dublin, Ireland. Clinical Effectiveness Research Group, University of Oslo and Oslo University Hospital, Oslo, Norway. Servicio de Gastroenterologia, Instituto Portugues de Oncologia Francisco Gentil, Porto, Portugal. Department of Medicine I, Josephs-Hospital Warendorf, Academic Teaching Hospital, University of Muenster, Warendorf, Germany. Endoscopy Unit, Nuovo Regina Margherita Hospital, Rome, Italy. Department of Gastroenterology, Hepatology and Oncology, Medical Center for Postgraduate Education, Warsaw, Poland. Department of Gastroenterological Oncology and Department of Cancer Prevention, The Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland. Department of Health Management and Health Economics, University of Oslo, Oslo, Norway. Northern Institute for Cancer Research, Newcastle University, Newcastle, UK. Department of Gastroenterology, Gloucestershire Hospitals NHS Foundation Trust, Gloucestershire, UK. Department of Gastroenterology and Hepatology. University Hospital Leuven, Leuven, Belgium. Department of Gastroenterology, University Hospital of North Tees, Stockton-on-Tees, Cleveland, UK.