1 Department of Dermatology and Venereology, Medical Faculty, Medical University, 15A V. Aprilov Blvd., 4002, Plovdiv, Bulgaria. hristo_dobrev@yahoo.com.
2 Department of Dermatology and Venereology, Medical Faculty, Medical University, 15A V. Aprilov Blvd., 4002, Plovdiv, Bulgaria.