1. Department of Dermatology and Venereology, Medical Faculty Trakia University and UMHAT “Prof. Dr. St. Kirkovich” Stara Zagora Bulgaria
2. Department of Rheumatology Burgas University “Prof. Dr. Asen Zlatarov” Burgas and UMHAT Burgas Burgas Bulgaria
3. Laboratory of Cytogenetics and Molecular Biology National Haematology Hospital Sofia Bulgaria
4. Department of Medical Oncology Complex Oncology Center Burgas Bulgaria
5. Department of Experimental Research Medical University Pleven Pleven Bulgaria