1. Pediatric Unit, Teaching Hospital Karapitiya, Galle, Sri Lanka
2. Department of Community Medicine, Faculty of Medicine, University of Ruhuna, Galle, SriLanka
3. Department of Pediatrics, Faculty of Medicine, University of Ruhuna, Galle, Sri Lanka
4. The Mind Research Network and Department of Neurology & Pediatrics, University of New Mexico, Albuquerque, NM, USA
5. Pediatric Neurology Unit, Teaching Hospital Karapitiya, Galle, Sri Lanka