Affiliation: | 1. Division of Pediatric Oncology, Ankara Children's Hematology and Oncology Hospital, Ankara, Turkey;2. Department of Pathology, Baskent University, Faculty of Medicine, Ankara, Turkey;3. Department of Pathology, Faculty of Medicine, Hacettepe University, Ankara, Turkey;4. Department of Pediatric Surgery, Faculty of Medicine, Baskent University, Ankara, Turkey |