1. Consultant Pediatric Neurologist, King Khalid and King Abdul Aziz University Hospitals, Riyadh, Saudi Arabia
2. Assistant Professor, Department of Community Medicine, College of Medicine, King Saud University, Riyadh, Saudi Arabia
3. Assistant Professor and Consultant, Department of Pediatrics, College of Medicine and King Khalid University Hospital, Chief of Medical Staff, King Abdul Aziz University Hospital, King Saud University, P. O. Box 2925, Riyadh 11461, Saudi Arabia