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 Gastroenterology and Hepatology, University Medical Center Utrecht, Heidelberglaan 100, Utrecht 3584 CX, the Netherlands.
3 Department Gastroenterology and Hepatology, St Antonius Hospital, Nieuwegein, the Netherlands.