Sophie L Giles1, Robert J F Laheij2. 1. Department of Gastroenterology and Hepatology, Elisabeth-TweeSteden Hospital, Hilvarenbeekse Weg 60, 5022GC Tilburg, The Netherlands. 2. Department of Gastroenterology and Hepatology, Elisabeth-TweeSteden Hospital, Hilvarenbeekse Weg 60, 5022GC Tilburg, The Netherlands. Electronic address: R.Laheij@etz.nl.