1. Department of Dermatology, Université catholique de Louvain, Brussels, Belgium;
2. Department of Dermatology, Hospital del Mar, Universitat Autònoma, Barcelona, Spain;
3. Department of Dermatology and Allergy, Allergie-Centrum-Charité/ECARF, Charité - Universitätsmedizin Berlin, Berlin, Germany;
4. Integrated Dermatology Service, Ipswich Hospital NHS Trust, Ipswich, United Kingdom;
5. Department of Dermatology, University of Kiel, Kiel, Germany