1. Dermatology and Venereology; Medical University of Plovdiv; Vasil Aprilov 15A Plovdiv 4002 Bulgaria
2. ‘Onkoderma’ - Policlinic for Dermatology and Dermatologic Surgery; General Skobelev Street 26 Sofia Bulgaria
3. Dermatology, Venereology and Dermatologic Surgery; Ministry of the Interior; General Skobelev Street 79 Sofia 1606 Bulgaria