1 Department of Gastroenterology and Hepatology, Amsterdam University Medical Centres, Amsterdam, Netherlands. Electronic address: e.dekker@amc.uva.nl.
2 Department of Gastroenterological Oncology and Department of Cancer Prevention, The Maria Sklodowska-Curie Institute-Oncology Center, Warsaw, Poland; Department of Gastroenterology, Hepatology, and Oncology, Medical Centre for Postgraduate Education, Warsaw, Poland; Institute of Health and Society, University of Oslo, Oslo, Norway.