University of Amsterdam - Amsterdam University Medical Centers, Harvard University - Harvard Medical School, Washington University in St. Louis - Division of Gastroenterology and Inflammatory Bowel Diseases Centre, Department of Medicine, Case Western Reserve University, Thomas Jefferson University, Technion-Israel Institute of Technology - Rambam Health Care Campus, Technion-Israel Institute of Technology - Rambam Health Care Campus, University of Amsterdam - Amsterdam University Medical Centers, University of Amsterdam - Amsterdam University Medical Centers, Leiden University and VU University Medical Centre - Department of Gastroenterology and Hepatology