1. Department of Dermatology, Hôpital Erasme, Université Libre de Bruxelles, 1070 Brussels, Belgium
2. Department of Dermatology, Institute Jules Bordet, Université Libre de Bruxelles, 1070 Brussels, Belgium
3. Molecular and Pharmaco-Epidemiology Unit, Department of Experimental Oncology, European Institute of Oncology, IRCCS, 20139 Milan, Italy