1. Department of Gastroenterology and Hepatology CHU UCL Namur, Université Catholique De Louvain, Yvoir, Belgium
2. Department of Gastroenterology Hepatopancreatology, and Digestive Oncology, C.U.B. Hôpital Erasme, Université Libre De Bruxelles, Brussels, Belgium
3. Department of Gastroenterology and Hepatology, Clinique St Luc, Bouge, Belgium