1. Departments of Dermatology, Venereology, Allergology and Immunology; Dessau Medical Center; Auenweg 38 06847 Dessau Germany
2. Department of Clinical and Experimental Medicine; Section of Dermatology; Azienda Ospedaliero-Universitaria di Ferrara; University of Ferrara; via Aldo Moro 8, Località Cona-44100 Ferrara Italy