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Received: 17.04.2018 Accepted: 24.07.2018 1Istanbul Medeniyet University, Goztepe Training and Research Hospital, Department of Nephrology, Istanbul, Turkey 2University of Health Sciences Tepecik Training and Research Hospital, Department of Biochemistry, Izmir, Turkey Yazışma adresi: Gulsah Sasak, Istanbul Medeniyet University, Goztepe Training and Research Hospital, Department of Nephrology, Istanbul, Turkey e-mail: gulsahsasak@gmail.com

Serum FGF-23 levels in predialysis chronic kidney disease are not associated with 25-OH D vitamin levels