1. Department of Nephrology, Medical Faculty , University of Ss. Cyril and Methodius , Skopje , N. Macedonia
2. Department of Urology, Medical Faculty , University of Ss. Cyril and Methodius , Skopje , N. Macedonia
3. Institute for Transfusion Medicine , Skopje , N. Macedonia
4. Macedonian Academy of Sciences and Arts Skopje , N. Macedonia