1. Department of Dermatology and Allergology, Municipal Hospital Dresden, Academic Teaching Hospital, Dresden, Germany.
2. Department of Plastic Surgery, Hospital São Lucas da PUCRS, Porto Alegre/RS, Brazil.
3. Clinic for Skin and Venereal Diseases, UCC Nis, Medical Faculty, University of Nis, Nis, Serbia.
4. Department of Chemistry, Faculty of Science and Mathematics, University of Niš, Niš, Serbia.