Affiliation: | 1. Department of Dermatology, University of Copenhagen, Bispebjerg Hospital, 2400 Copenhagen, Denmark;2. Department of Dermatology, University of Copenhagen, Roskilde Hospital, 4000 Roskilde, Denmark;3. Department of Dermatology, University of Groningen, University Medical Centre Groningen, Groningen 9700 RB, The Netherlands;4. Department of Clinical Social Medicine, Occupational and Environmental Dermatology, University of Heidelberg, 69115 Heidelberg, Germany |