1. Department of Medical Informatics, Biometry and Epidemiology University of Erlangen/Nürnberg Erlangen Germany
2. Department of Dermatology, University Allergy Centre, Medical Faculty Carl Gustav Carus Technical University Dresden Dresden Germany
3. Dermatology Unit, Department of Paediatrics University of Padova Padova Italy
4. Allergy Unit, Department of Dermatology University Hospital Basel Basel Switzerland
5. Faculty of Biomedicine Università della Svizzera Italiana Lugano Switzerland
6. Department of Dermatology, Environmental Medicine and Health Theory University of Osnabrück Osnabrück Germany
7. Department of Dermatology, Venereology and Allergology University Medical Center Göttingen Göttingen Germany
8. Department of Dermatology Oxford University Hospitals NHS Trust Oxford UK
9. Department of Dermatology Poznan University of Medical Sciences Poznań Poland
10. Department of Dermatology, Venereology and Allergology, St. Josef Hospital Ruhr University Bochum Bochum Germany
11. Department of Dermatology University Medical Centre Maribor Maribor Slovenia
12. Information Network of Department of Dermatology University Medical Center Göttingen Germany
13. Department of Dermatology Hospital del Mar. Universitat Autònoma and Pompeu Fabra Barcelona Spain
14. Department of Dermatology, Coimbra University Hospital and Faculty of Medicine University of Coimbra Coimbra Portugal
15. National Allergy Research Centre, Department of Skin and Allergy Gentofte Hospital Hellerup Denmark
16. Department of Dermatology Leicester Royal Infirmary Leicester UK
17. Department of Dermatology, University Hospital Erlangen, Erlangen, Germany Paul‐Ehrlich‐Institut Langen Germany
18. Department of Dermatology Free University of Amsterdam Amsterdam The Netherlands
19. Dermatology Department, Hospital Universitario de la Princesa Instituto de Investigación Sanitaria la Princesa (IIS‐IP) Madrid Spain
20. Department of Dermatology University of Groningen, University Medical Center Groningen Groningen The Netherlands
21. Department of Dermatology, Inselspital Bern University Hospital, University of Bern Bern Switzerland
22. Department of Experimental Dermatology and Cosmetology Jagiellonian University Medical College Krakow Poland
23. Department of Skin and Venereal Diseases Lithuanian University of Health Sciences Kaunas Lithuania
24. Department of Clinical Social Medicine, Occupational and Environmental Dermatology University Hospital Heidelberg Heidelberg Germany
25. Cutaneous Allergy Team, St. John's Institute of Dermatology Guy's Hospital London UK
26. Dermatology Department Leeds Teaching Hospitals NHS Trust Leeds UK