1. Pediatric Department-Habib Bougatfa Hospital Bizerta-Tunisia, University of Tunis El Manar Faculty of Medicine of Tunis, Tunis, Tunisia
2. Pediatric Department B-Infant’s hospital Bechir Hamza Tunis, Universite de Tunis El Manar Faculte de Medecine de Tunis, Tunis, Tunisia
3. Oto Rhino Laryngology Department- Salah Azaiz institute Tunis, University of Tunis El Manar-Faculty of medicine of Tunis, Tunis, Tunisia