1. Department of Orthopedic Surgery and Traumatology, Faculty of Medicine, University of Menoufiya, Menoufiya Egypt
2. Pediatric Orthopedic Fellowship, University of Toronto, Toronto Canada
3. King Abdulaziz Medical City, National Guard Hospital, Jeddah Kingdom of Saudi Arabia
4. 3, Moustafa Kamel El-Rifaii, Janaklis, Alexandria Egypt