1. Dermatology Department; Elias University Hospital; Carol Davila University of Medicine and Pharmacy Bucharest; 17, Marasti Blvd Sector 1 Bucharest Romania
2. Department of Dermatology; Erasme Hospital; Université Libre de Bruxelles; 1070 Bruxelles Belgium
3. Department of Dermatology; University of Athens Medical School; Andreas Sygros Hospital; Dragoumi 5 161 21 Athens Greece
4. Department of Social and Behavioral Sciences; Harvard School of Public Health; Kresge Building, 677 Huntington Ave. Boston MA 02115 U.S.A