1. Department of Skin and Venereal Diseases , Medical Institute of the Ministry of Internal Affairs
2. Department of Purulent-Septic Surgery , University Multi-Profile Hospital for Active Treatment and Emergency Medicine “N. I. Pirogov”
3. Department of Infectious Diseases, Parasitology and Dermatovenereology , Medical University , Varna
4. Department of Dermatology and Venereology , Medical University , Sofia