1. Department of Nephrology, Internal Disease Clinic, University Hospital “Saint Anna”, 1750 Sofia, Bulgaria
2. Faculty of Medicine, Medical University Sofia, 1504 Sofia, Bulgaria
3. Head Biometrics Group, Comac-Medical Ltd., 1404 Sofia, Bulgaria
4. Department of Clinical Laboratory, University Hospital “Alexandrovska”, 1431 Sofia, Bulgaria
5. Cardiology Department, University Hospital “Alexandrovska”, 1431 Sofia, Bulgaria
6. Nephrology, Hemodialysis, Apheresis and Kidney Transplantation Department, Grenoble University Hospital, 38043 Grenoble, France
7. Internal Disease Department, Grenoble Alpes University, 38043 Grenoble, France