1. Laboratory for Cellular Physiology, Institute of Medical Physiology, School of Medicine; University of Belgrade; Belgrade Serbia
2. Institute of Histology and Embryology, School of Medicine; University of Belgrade; Belgrade Serbia
3. University Clinic “Narodni Front”, School of Medicine; University of Belgrade; Belgrade Serbia
4. Department of Mathematics; University of Salerno; Fisciano Italy
5. Institute of Medical Physiology, School of Medicine; University of Belgrade; Belgrade Serbia
6. Institute of Pathology, School of Medicine; University of Belgrade; Belgrade Serbia