1. 1st Department of Dermatology and Venereology Aristotle University of Thessaloniki Thessaloniki Greece
2. Pathology Department, Faculty of Medicine Aristotle University of Thessaloniki Thessaloniki Greece
3. 2nd Department of Dermatology and Venereology Aristotle University of Thessaloniki Thessaloniki Greece
4. School of Statistics and Insurance Science University of Western Macedonia Kozani Greece