1. Department of Nephrology, Numune State Hospital, 42690 Konya, Turkey
2. Department of Medicine, Division of Nephrology, Mengucek Gazi Training and Research Hospital, Erzincan University, Erzincan, Turkey
3. Nephrology Clinic, Dialysis and Renal Transplant Center, C.I. Parhon University Hospital, “Gr. T. Popa” University of Medicine and Pharmacy, 700115 Iasi, Romania
4. Department of Medicine, Division of Nephrology, Istanbul Medeniyet University, Istanbul, Turkey