1. Hôpital ibn-sina, Service d’hépatogastro-entérologie et proctologie Medecine B, Rabat, Morocco
2. Mohammed V University in Rabat, Rabat, Morocco
3. AP-HP, Cochin hopsital, department of gastroenterology and oncology, 75014 Paris, France
4. Paris V, Paris Descartes faculty of medicine
5. Hôpital Percy, Paris, France
6. AP-HP, Cochin hospital, department of digestive, hepatobiliary and pancreatic surgery, 75014 Paris, France