Institution: | (1) Department of Orthopedic Surgery, Faculty of Medicine, Hacettepe University, 06100 Ankara, Sihhiye, Turkey;(2) Department of Epidemiologic Oncology, Faculty of Medicine, Hacettepe University, Ankara, Turkey;(3) Department of Statistics, Faculty of Medicine, Ankara University, Ankara, Turkey;(4) Department of Pediatrics, Faculty of Medicine, Hacettepe University, Ankara, Turkey |