1. Department of Gerontobiology, Pomeranian Medical University, Szczecin, Poland;
2. Warsaw School of Economics, Warsaw, Poland;
3. Department of Infectious, Tropical Diseases, Pomeranian Medical University, Szczecin, Poland;
4. Department of Medical Biochemistry, Faculty of Medicine, University of Sarajevo, Sarajevo, Bosnia and Herzegovina;
5. Department of Human Physiology, Faculty of Medicine, University of Sarajevo, Sarajevo, Bosnia and Herzegovina