1. Department of Cardiology, Koc University Hospital, Istanbul, Turkey
2. Department of Nephrology, Suleyman Demirel University School of Medicine, Isparta, Turkey
3. Nephrology Clinic, Dialysis and Renal Transplant Center, “C.I. PARHON” University Hospital, “Grigore T. Popa” University of Medicine, Iaşi, Romania
4. Department of Pulmonary Medicine, Sleep Disorders Unit, Istanbul Medeniyet University Hospital, Istanbul, Turkey
5. Koc University School of Medicine, Istanbul, Turkey
6. Division of Nephrology, Department of Medicine, Koc University School of Medicine, Istanbul, Turkey