1. Departments of Dermatology, Venereology, Allergology and Immunology; Dessau Medical Center; Dessau Germany
2. St Johns Institute of Dermatology; Guys & St Thomas' NHS Trust; London UK
3. Section of Dermatology I; Department of Medicine; Karolinska Institutet; Huddinge University Hospital; Stockholm Sweden
4. Department of Dermatology; University of Bern; Bern Switzerland
5. Department of Dermatology; Aristotle University of Thessaloniki; Thessaloniki Greece
6. Department of Dermatology; University of Debrecen; Debrecen Hungary
7. Department of Dermatology, Venereology and Allergology; Wroclaw Medical University; Wroclaw Poland
8. Department of Dermatology; Erasmus MC; University Medical Center; Rotterdam The Netherlands
9. Department of Dermatology; Henri Mondor Hospital; Creteil France
10. Department of Dermatology, Venerology and Allergology; University Hospital Charité; Berlin Germany
11. Department of Dermatology; Roskilde Hospital; University of Copenhagen; Copenhagen Denmark