1. Clinic for Cardiology, University Clinical Center of Serbia, 11 000 Belgrade, Serbia
2. Faculty of Medicine, University of Belgrade, 11 000 Belgrade, Serbia
3. Clinic for Endocrinology, University Clinical Center of Serbia, 11 000 Belgrade, Serbia
4. Blood Transfusion Institute of Serbia, 11 000 Belgrade, Serbia
5. Institute for Hygiene and Medical Ecology, 11 000 Belgrade, Serbia