Academy of Silesia, Academy of Silesia, Agency of Medical Research, Endomed, Polish Foundation of Gastroenterology, University of Oslo, Karolinska Institutet, Polish Foundation of Gastroenterology, University of Oslo, IRCCS Humanitas Research Hospital - Department of Biomedical Sciences, Academy of Silesia, Sørlandet Hospital, Centre of Gastroenterology, Frontier Science Scotland Ltd, University of Warwick, Universidad de Barcelona - Hospital Clínic Barcelona, University of Cambridge - MRC Cancer Unit, University of Oslo, University of Oslo - Clinical Effectiveness Group, University of Oslo - Clinical Effectiveness Group and Showa University Northern Yokohama Hospital