1. Leeds Teaching Hospitals NHS Trust; Leeds UK
2. Clinic of Dermatology, University Hospital and Faculty of Medicine; University of Coimbra; Coimbra Portugal
3. University Hospital Antwerp (UZA) and University of Antwerp (UA); Antwerp Belgium
4. Clinic Colentina; Bucharest Romania
5. National Allergy Research Centre, Department of Dermatology and Allergy; Copenhagen University Hospital Herlev-Gentofte; Hellerup Denmark
6. VU University; Amsterdam The Netherlands
7. Department of Dermatology, Venereology and Allergology; Ruhr University Bochum; Bochum Germany
8. Allergy Section; Marina Baixa Hospital; Villajoyosa Spain
9. Department of Dermatology; Hospital del Mar, IMIM; Barcelona Spain
10. Contact Dermatitis Institute; Phoenix Arizona
11. Department of Occupational and Environmental Dermatology; Lund University, Skåne University Hospital; Malmö Sweden
12. Paul Ehrlich Institute; Langen Germany
13. Chemotechnique Diagnostics; Vellinge Sweden
14. 152 Harley Street; London UK
15. IRCCS Galeazzi Orthopaedic Institute, Milan Department of Biomedical, Surgical and Dental Sciences; University of Milan; Milan Italy
16. Department of Dermatology, Venerology and Dermatooncology; Semmelweis University; Budapest Hungary
17. University of Groningen, University Medical Centre Groningen; Groningen The Netherlands
18. Jagiellonian University Medical College; Krakow Poland
19. Department of Medical Informatics, Biometry and Epidemiology; University of Erlangen-Nürnberg; Erlangen Germany