1. University Hospital of Halle, Halle (Saale), Germany and University of Münster Münster Germany
2. Medical University Innsbruck Innsbruck Austria
3. Meguro Chen Dermatology Clinic Tokyo Japan
4. Universidad Autónoma Madrid Spain
5. John H. Stroger Jr. Hospital of Cook County and Rush University Medical Center Chicago Illinois
6. Albany Medical College Albany New York
7. University of British Columbia Vancouver British Columbia Canada
8. University of Lübeck Lübeck Germany
9. Hospital Saint‐Louis University Paris 7 Paris France
10. Medical University of Graz Graz Austria
11. University of Pennsylvania and Corporal Michael J. Crescenz Veterans Affairs Medical Center Philadelphia Pennsylvania
12. Mayo Clinic Rochester Minnesota
13. Nippon Medical School Tokyo Japan
14. University of Oxford Oxford UK
15. University Paris 6 Hôpital Tenon Paris France
16. Wake Forest School of Medicine Winston Salem North Carolina
17. Ipswich Hospital NHS Trust, Ipswich, UK and Norwich Medical School University of East Anglia Norwich UK
18. University of Münster Münster Germany
19. University of Florence Florence Italy
20. Akdeniz University School of Medicine Antalya Turkey
21. University of Louisville Louisville Kentucky
22. Stanford University School of Medicine Stanford California
23. University of Pennsylvania Philadelphia
24. University of North Carolina at Chapel Hill