1. Institute for Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) and Department of Dermatology, Environmental Medicine and Health Theory, Osnabrück University Osnabrück Germany
2. Paul‐Ehrlich‐Institut, Allergology Division Langen Germany
3. University Hospital Antwerp (UZA) and University of Antwerp Antwerp Belgium
4. Department of Dermatology University Allergy Center, University Hospital Carl Gustav Carus, Technical University Dresden Dresden Germany
5. Department of Internal Medicine A.O.R.N. Antonio Cardarelli Naples Italy
6. Department of Medical Sciences and Public Health and Unit of Allergy and Clinical Immunology University Hospital “Duilio Casula”, University of Cagliari Cagliari Italy
7. Department of Dermatology Venereology and Allergology, St. Josef Hospital, University Medical Center, Ruhr University Bochum Bochum Germany
8. Section of Dermatology, Department of Medical Sciences University of Ferrara Ferrara Italy
9. Department of Occupational and Environmental Diseases University Hospital of Centre of Paris, Hotel‐Dieu Hospital, AP‐HP Paris France
10. Section of Dermatology, Department of Health Sciences University of Genoa and Ospedale Policlinico San Martino, IRCCS Genoa Italy
11. Allergy Section, Marina Baixa Hospital Villajoyosa Spain
12. Department of Dermatology Hospital del Mar Research Institute, Universitat Pompeu Fabra Barcelona Spain
13. Center for Rhinology and Allergology Wiesbaden Germany
14. Laboratoire de Dermatochimie, University of Strasbourg, Institut Le Bel Strasbourg France
15. Department of Dermatology and Venereology University Hospital Center Zagreb, School of Medicine University of Zagreb Zagreb Croatia
16. Department of Dermatology Skaraborg Hospital Skövde Sweden
17. Department of Dermatology and Allergy Centre Odense University Hospital, University of Southern Denmark Odense Denmark
18. Department of Dermatology and Venereology Istanbul Faculty of Medicine, Istanbul University Istanbul Turkey
19. Finnish Institute of Occupational Health, Occupational Medicine Helsinki Finland
20. Department of Dermatology Montpellier University Hospital and Montpellier University Montpellier France
21. Department of Dermatology‐Allergology and Occupational Dermatology Amsterdam University Medical Centers Amsterdam The Netherlands
22. Department of Experimental Dermatology and Cosmetology Jagiellonian University Medical College Krakow Poland
23. Section of Dermatology, Department of Medicine and Surgery University of Perugia Perugia Italy
24. Department of Dermatology Cleveland Clinic and Cleveland Clinic Lerner College of Medicine of Case Western Reserve University Cleveland Ohio USA
25. Allergy Unit, IBIMA‐Regional University Hospital of Malaga, UMA, RETICS ARADyAL, BIONAND Malaga Spain
26. Department of Medical Informatics Biometry and Epidemiology, University of Erlangen Erlangen Germany
27. Department of Cutaneous Allergy St. John's Institute of Dermatology, Guy's Hospital London UK
28. Leeds Teaching Hospitals NHS Trust Leeds UK
29. National Allergy Research Centre, Department of Skin and Allergy University of Copenhagen, Gentofte Hospital Copenhagen Denmark