1 Department of Gastroenterology and Hepatology, Amsterdam Gastroenterology Endocrinology Metabolism (AGEM) Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.
2 Department of Gastroenterology and Hepatology, Leiden University Medical Centre, Leiden, the Netherlands.
3 Department of Gastroenterology, Radboud University Medical Center, Nijmegen, the Netherlands.