1. Department of Dermatology, Cliniques Universitaires Saint-Luc & Pôle Pneumologie, ORL et Dermatologie Institut de Recherche Expérimentale et Clinique (IREC); Université Catholique de Louvain; 1200 Brussels Belgium
2. Department of Dermatology; University Hospital, Katholieke Universiteit Leuven; 3000 Leuven Belgium
3. Department of Occupational and Environmental Dermatology; Lund University, Skane University Hospital; 205 02 Malmö Sweden