1. Cardiology Clinic; Türkiye Yuksek Ihtisas Training and Research Hospital; Ankara Turkey
2. Nephrology Clinic, Dialysis and Renal Transplant Center; ‘C.I. PARHON’ University Hospital, and ‘Grigore T. Popa’ University of Medicine; Iasi Romania
3. Division of Nephrology; Department of Medicine; Koc University School of Medicine; Istanbul Turkey