Kenan Barut1, Muruvet Guler1, Metin Sezen1, Ozgur Kasapçopur2. 1. Department of Paediatric Rheumatology, Cerrahpasa Medical School, Istanbul University, Turkey. 2. Department of Paediatric Rheumatology, Cerrahpasa Medical School, Istanbul University, Turkey. ozgurkasapcopur@hotmail.com.