1. Laboratory Of Cell Biology, Medical University, Varna, Bulgaria
2. Department Of Physiology, Medical Faculty, Osmangazi University, Eskisehir, Turkey
3. Department Of Pathophysiology, Medical University, Lublin, Poland
4. Institute Of Cellular Biology And Neurobiology, Cnr, Rome, Italy
5. Department Of Histology And Embryology, Medical Faculty, Niš, Serbia
6. Department Of Cardiac Surgery, University St Marina Hospital, Varna, Bulgaria
7. Clinic Of Urology, St Anna Hospital, Varna, Bulgaria
8. Clinic Of Urology, University St Marina Hospital, Varna, Bulgaria
9. Department Of General And Clinical Pathology, Medical University, Varna, Bulgaria
10. Institute Of Cell Biology And Neurobiology, National Research Council (Cnr), Rome, Italy