1. Department of Gastroenterology; St. Luc University Hospital; Brussels; Belgium
2. Department of Pathology; St. Luc University Hospital; Brussels; Belgium
3. Department of Cardiology and Nephrology; St. Luc University Hospital; Brussels; Belgium
4. Department of Gastroenterology; Hospital Iris Sud - Bracops; Brussels; Belgium
5. Department of Gastroenterology; Hôpital St-Luc; Bouge-Namur; Belgium
6. Department of Biochemistry; St. Luc University Hospital; Brussels; Belgium
7. Department of Gastroenterology; Hôpital Saint-André; Bordeaux; France