1. Faculty of Medicine, Department of Pediatric Surgery, Hacettepe University, Altındağ, Ankara, Turkey
2. Faculty of Medicine, Department of Pediatric Oncology, Hacettepe University, Altındağ, Ankara, Turkey
3. Faculty of Medicine, Department of Pathology, Hacettepe University, Altındağ, Ankara, Turkey
4. Faculty of Medicine, Department of Pediatric Radiology, Hacettepe University, Altındağ, Ankara, Turkey