Biography:

Rayan Abdulrahim Al-Sharief Professor of Pediatric Endocrinology, King Abdulaziz University Hospital, Saudi Arabia. His research interst is Vitamin D, Trisomy 21, Coeliac, Hypothyroidism, Autoimmune, Diabetes and his one of the publication is Autoimmunity and Vitamin D deficiency in children affected with Trisomy 21.