Z Apalla1, E Sotiriou2, A Trigoni3, D Ioannides1. 1. First Dermatology Department, Aristotle University of Thessaloniki, Greece. 2. First Dermatology Department, Aristotle University of Thessaloniki, Greece. Electronic address: elenasotiriou@yahoo.gr. 3. State Clinic, Hospital of Skin and Venereal Diseases, Thessaloniki, Greece.