*Trakya University School of Medicine, Division of Hematology, Edirne, Turkey;† Istanbul University Istanbul School of Medicine, Division of Pediatric Hematology, Istanbul, Turkey; ‡Hacettepe University School of Medicine, Division of Hematology, Ankara, Turkey; §Cukurova University School of Medicine, Division of Pediatric Hematology, Adana, Turkey; ¶Istanbul Training and Research Hospital, Adult Hematology Clinic, Istanbul, Turkey; **Istanbul University Cerrahpasa School of Medicine, Division of Hematology, Istanbul, Turkey; ††Gazi University School of Medicine, Division of Pediatric Hematology, Ankara, Turkey; ‡‡Ege University School of Medicine, Division of Pediatric Hematology, Izmir, Turkey; §§Istanbul Bilim University School of Medicine, Division of Hematology, Istanbul, Turkey; ‡Gaziantep University School of Medicine, Division of Hematology, Gaziantep, Turkey; and **Istanbul Medical School Institute of Oncology, Department of Pediatric Hematology/Oncology, Istanbul, Turkey