A Wollenberg1,2, J Szepietowski3, A Taieb4, J Ring5,6. 1. Department Dermatology and Allergy, Ludwig-Maximilian University, Munich, Germany. 2. München Klinik Thalkirchner Straße, Munich, Germany. 3. Department of Dermatology, Venereology and Allergology, Wroclaw Medical University, Wroclaw, Poland. 4. Department of Dermatology and Pediatric Dermatology, Hospital St. Andre, Bordeaux, France. 5. Department of Dermatology and Allergy Biederstein, Technische Universität München, Munich, Germany. 6. Christine Kühne Center for Allergy Research and Education CK-CARE, Davos, Switzerland.