Sezgin Sahin1, Amra Adrovic1, Kenan Barut1, Ozgur Kasapcopur2. 1. Department of Paediatric Rheumatology, Istanbul University, Cerrahpasa Medical Faculty, Istanbul, Turkey. 2. Department of Paediatric Rheumatology, Istanbul University, Cerrahpasa Medical Faculty, Istanbul, Turkey. ozgurkasapcopur@hotmail.com.