1. Department of Dermatology; Medical University of Vienna; Vienna Austria
2. Department of Dermatology and Venereology; University Hospital of Cologne; Cologne Germany
3. Department of Dermatology, Venereology and Allergology; HELIOS St. Elisabeth Klinik Oberhausen; University Witten-Herdecke; Oberhausen Germany
4. Department of Dermatology, Venereology and Allergology; Kantonsspital St. Gallen; St. Gallen Switzerland
5. Service de Médecine Interne; Centre de Référence Maladies Rares: Vascularites et Sclérodermie Systémique; Hôpital Cochin; Assistance Publique Hôpitaux de Paris; Paris France
6. Research Laboratories and Academic Division of Clinical Rheumatology; IRCCS San Martino; University Medical School of Genoa; Genoa Italy
7. Department of Medical Sciences and Public Health; Dermatology Unit; University of Cagliari; Cagliari Italy
8. Centre for Rheumatology; Division of Medicine; University College London; London UK
9. Department of Dermatology; Medical University of Warsaw; Warsaw Poland
10. Dermatology Unit; Hospital of Lecco; Lecco Italy
11. Department of Rheumatology; Ghent University Hospital; Ghent Belgium
12. Department of Clinical and Molecular Science; Università Politecnica delle Marche; Ancona Italy
13. Department of Dermatology and Venereology; Medical University of Graz; Graz Austria
14. Department of Dermatology; Hôpital Saint-Louis; Hôpitaux Universitaires; Paris France
15. Department of Dermatology, Venereology and Dermatooncology; Semmelweis University; Budapest Hungary
16. Department of Dermatology; University Hospital of Aarhus; Aarhus Denmark
17. Hamburg Centre for Pediatric and Adolescent Rheumatology; Schön Klinik Hamburg Eilbek; Hamburg Germany
18. Department of Dermatology and Allergology; Hôpital Tenon; Assistance Publique Hôpitaux de Paris; Université Pierre et Marie Curie; Paris France
19. Division of Immunology, Allergy and Infectious Diseases; Department of Dermatology; Medical University of Vienna; Vienna Austria
20. Department of Dermatology and Venereology; Turku University Hospital and University of Turku; Turku Finland
21. Department of Dermato-Allergology; Herlev and Gentofte University Hospital; Copenhagen Denmark
22. Department of Dermatology, Venereology and Pediatric Dermatology; Medical University of Lublin; Lublin Poland
23. Department of Dermatology; Connective Tissue Diseases Service; Royal Free Hospital; London UK
24. Department of Dermatology, Allergology and Venereology; University of Helsinki, and Skin and Allergy Hospital; Helsinki University Central Hospital; Helsinki Finland
25. Department of Dermatology; IRCCS San Martino; University Medical School of Genoa; Genoa Italy
26. Department of Medical Sciences; University of Turin; Turin Italy
27. Department of Dermatology, Allergology and Venereology; Inflammation Center; University of Helsinki and Helsinki University Hospital; Helsinki Finland
28. Department of Dermatology; Hospital del Mar-Parc de Salut Mar; Universitat Autònoma de Barcelona; Barcelona Spain
29. Department of Dermatology and Pediatric Dermatology; National Centre for Rare Skin Disorders; Hôpital Saint-Andre; University of Bordeaux; Bordeaux France
30. Department of Dermatology; University Hospital of Erlangen; Erlangen Germany
31. Department of Dermatology and Venereology; University Hospital Halle; Halle (Saale) Germany
32. Department of Dermatology, Venereology and Allergology; University Hospital Charité - Universitätsmedizin Berlin; Berlin Germany