1. Department of Gastroenterology and Hepatology, Medical Centre for Postgraduate Education and Department of Gastroenterology, The M. Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
2. Digestive Endoscopy Unit, Universita’ Cattolica del Sacro Cuore, Rome, Italy
3. CHU Mont-Godinne, Université catholique de Louvain, Yvoir, Belgium
4. Department of Digestive Endoscopy, Hôpital Saint Joseph, Marseille, France
5. Endoscopic Unit, Paoli-Calmettes Institut, Marseille, France
6. Department of Gastroenterology, Hôpital Privé Jean Mermoz, Lyon, France
7. Service of Gastroenterology and Hepatology, Geneva University Hospitals, Geneva, Switzerland