1. Faculty of Medicine, Department of Nephrology Ankara Yildirim Beyazit Üniversity Ankara Turkey
2. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Solna Sweden
3. Department of Nephrology Medicana International Hospital Istanbul Turkey
4. Department of Nephrology Ankara Education and Research Hospital Ankara Turkey
5. Faculty of Medicine, Department of Nephrology Atılım University Ankara Turkey