1. Department of Dermatology Cliniques universitaires Saint‐LucUniversité catholique de Louvain (UCLouvain) Brussels Belgium
2. Department of Medical Informatics, Biometry and Epidemiology Univ. Erlangen/Nürnberg Erlangen Germany
3. Department of Dermatology and Allergology Amsterdam University Medical Centres Amsterdam The Netherlands
4. Dermatology Unit Skaraborgs Hospital Skövde Skövde Sweden
5. Occupational Health Unit Finnish Institute of Occupational Heath Helsinki Finland
6. Department of Dermatology and Allergy National Allergy Research Centre Herlev‐Gentofte HospitalUniversity of Copenhagen Copenhagen Denmark
7. Department of Dermatology Coimbra University Hospital and Faculty of Medicine University of Coimbra Coimbra Portugal
8. Cutaneous Allergy Team St. John's Institute of Dermatology Guy's Hospital London UK
9. Department of Advanced Biomedical Sciences University of Naples Federico II Napoli Italy
10. Department of Dermatology Hospital del Mar. Universitat Autònoma de Barcelona Barcelona Spain
11. Department of Dermatology and Allergy Biederstein School of Medicine Technical University of Munich Munich Germany
12. Department of Dermatology and Allergy Center Odense Research Center for Anaphylaxis (ORCA)Odense University Hospital Odense Denmark
13. Med. Faculty Univ. Erlangen/Nuremberg Erlangen Germany
14. Contact Allergy Unit Department of Dermatology University Hospital KU Leuven Leuven Belgium