1 Department Gastroenterology and Hepatology, University Medical Center Utrecht, Heidelberglaan 100, Utrecht 3584 CX, the Netherlands. Electronic address: k.j.vanerpecum@umcutrecht.nl.
2 Department of Gastroenterology and Hepatology, Erasmus University Medical Center, Rotterdam, the Netherlands.
3 Department of Gastroenterology and Hepatology, Amsterdam University Medical Centers, Amsterdam, the Netherlands.