1. Pediatric Department, King Abdullah Specialized Children Hospital, Ministry of National Guard-Health Affairs, Riyadh, Saudi Arabia
2. Pediatric Department, King Fahad Medical City, Ministry of health, Riyadh, Saudi Arabia
3. Division of Rheumatology, Rheumatology Department, The Hospital for Sick Children, Departments of Pediatrics and Medicine, University of Toronto, Canada
4. Department of Medical Imaging, King Abdullah Specialized Children Hospital, Ministry of National guard-Health Affairs, Riyadh, Saudi Arabia