1. Department of Gastroenterology and HepatologyVU University Medical Center AmsterdamThe Netherlands
2. Department of Gastroenterology and HepatologyUniversity Medical Center GroningenGroningenThe Netherlands
3. Department of Gastroenterology and HepatologyErasmus University Medical CenterRotterdamThe Netherlands
4. Department of Gastroenterology and HepatologyLeiden University Medical CenterLeidenThe Netherlands