1. Centre Algerois de Pediatrie, Pediatric gastroenterology, Algiers, Algeria
2. Institut National de Santé Publique, Unité santé et environnement, Algiers, Algeria
3. Department of Pediatrics, Etablissement Public Hospitalier Bologhine Ibn Ziri, Hammamet, Algiers, Algeria
4. Department of Pediatrics A, Centre hospitalo-universitaire Issaad Hassani, Algiers, Algeria