1. Department of Dermatology, Cliniques universitaires Saint‐Luc, Brussels, and IREC (Institut de Recherche Experimentale et Clinique) Pôle Pneumologie, ORL, DermatologieUniversité Catholique de Louvain Brussels Belgium
2. Department of Occupational and Environmental Dermatology, Lund UniversitySkåne University Hospital Malmö Sweden
3. Department of DermatologyUniversity Hospital Antwerp (UZA) and University of Antwerp (UA) Antwerp Belgium
4. Department of DermatologyUniversity Hospitals Leuven Belgium