1. Department of Pediatrics, Pediatric Hematology Unit, Gazi University, Faculty of Medicine, Ankara, Turkey;
2. Departments of Nuclear Medicine, Gazi University, Faculty of Medicine, Ankara, Turkey;
3. Department of Pathology, Gazi University Faculty of Medicine, Ankara, Turkey;
4. Department of Pediatric Oncology, Gazi University Faculty of Medicine, Ankara, Turkey