1. Division of Endocrinology Diabetes and Metabolic Disorders, Zvezdara University Medical Center, Medical Faculty, University of Belgrade, 11000 Belgrade, Serbia
2. Cardiovascular Institute Dedinje, Medical Faculty, University of Belgrade, 11000 Belgrade, Serbia
3. Blood and Transfusion Institute of Serbia, 11000 Belgrade, Serbia
4. Institute of Medical Statistics and Informatics, Medical Faculty, University of Belgrade, 11000 Belgrade, Serbia