1. Second Dermatology Department, Aristotle University of Thessaloniki, 55535 Thessaloniki, Greece
2. First Dermatology Department, National and Kapodistrian University of Athens, 16121 Athens, Greece
3. Second Dermatology Department, National and Kapodistrian University of Athens, 16121 Athens, Greece
4. First Dermatology Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece