1. Second Dermatology Department School of Medicine Faculty of Health Sciences Aristotle University of Thessaloniki Thessaloniki Greece
2. Department of Epidemiology and Population Health London School of Hygiene and Tropical Medicine London UK
3. Dermomedica, Dermatology Unit Thessaloniki Greece
4. First Dermatology Department School of Medicine Faculty of Health Sciences Aristotle University of Thessaloniki Thessaloniki Greece
5. Second Dermatology Department Kapodistrian University of Athens Attikon Hospital Athens Greece
6. First Dermatology Department Kapodistrian University of Athens A. Syggros Hospital Athens Greece