1. Department of Dermatology and Allergology; Ludwig-Maximilian University; Munich Germany
2. Dermatologie, Venerologie und Allergologie; Universitätsklinikum Schleswig-Holstein; Kiel Germany
3. Laboratoires Pierre Fabre A-DERMA; Lavaur France
4. Clinical Epidemiology Unit; Istituto Dermopatico dell'Immacolata (IDI)-IRCCS FLMM; Rome Italy
5. Department of Dermatology; Aarhus University Hospital; Aarhus Denmark