1. Medical Faculty, Sofia University “St. Kliment Ohridski”, 1 Kozyak Str., 1407 Sofia, Bulgaria
2. Department of Genetics, Faculty of Biology, Sofia University “St. Kliment Ohridski”, 8 Dragan Tzankov Str., 1164 Sofia, Bulgaria
3. Department of Pharmacology and Toxicology, Faculty of Pharmacy, Medical University of Sofia, ul. Dunav 2, 1000 Sofia, Bulgaria
4. Laboratory of Hematopathology and Immunology, National Specialized Hospital for Active Treatment of Hematological Diseases, 6 Plovdivsko pole Str., 1756 Sofia, Bulgaria
5. Clinic of Rheumatology, Department of Rheumatology, Faculty of Medicine, Medical University-Sofia, 13 Urvich Str., 1612 Sofia, Bulgaria