1. Marmara University Faculty of Medicine, Department of Pediatric Hematology and Oncology, İstanbul, Turkey

2. Marmara University Pendik Training and Research Hospital, Clinic of Pediatric Hematology and Oncology, İstanbul, Turkey

3. Marmara University Faculty of Medicine, Department of Pathology, İstanbul, Turkey

4. Marmara University Faculty of Medicine, Department of Brain and Neurosurgery, İstanbul, Turkey