Leonora Louter1, Roelandt F J Schop2, Adriaan J van der Meer2,3. 1. Department of Internal Medicine and Gastroenterology, IJsselland Ziekenhuis, Postbus 690, 2900 AR, Capelle aan den IJssel, The Netherlands. leonoralouter@gmail.com. 2. Department of Internal Medicine and Gastroenterology, IJsselland Ziekenhuis, Postbus 690, 2900 AR, Capelle aan den IJssel, The Netherlands. 3. Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands.