1 Habib Thameur Hospital, Departement of gastroenterology, Tunis, Tunisia; Faculty of medecine of Tunis, university of Tunis El Manar, Tunis, Tunisia. Electronic address: sabbah_meriam@yahoo.fr.
2 Habib Thameur Hospital, Departement of gastroenterology, Tunis, Tunisia; Faculty of medecine of Tunis, university of Tunis El Manar, Tunis, Tunisia.