1. Department of Dermatology, Radboud University, Nijmegen, the Netherlands
2. Department of Dermatology, Northwestern University, Chicago, Illinois
3. Department of Pediatrics, Northwestern University, Chicago, Illinois
4. Department of Pediatric Medicine, Dermatology Section, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
5. Department of Dermatology, Mayo Clinic, Rochester, Minnesota
6. Department of Dermatology, Rady Children’s Hospital San Diego, University of California, San Diego
7. Department of Pediatrics, Rady Children’s Hospital San Diego, University of California, San Diego
8. Department of Dermatology, Phoenix Children’s Hospital, Phoenix, Arizona
9. now with the Department of Dermatology, UCLA (University of California, Los Angeles)
10. Department of Dermatology, University of Massachusetts Medical School, Worcester
11. Department of Dermatology and Allergy, Herlev-Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark
12. Department of Dermatology, Hôpital Victor Dupouy Argenteuil, Argenteuil, France
13. Department of Dermatology, St Louis University School of Medicine, St Louis, Missouri
14. Department of Pediatrics, St Louis University School of Medicine, St Louis, Missouri
15. Department of Dermatology and Allergy, Charité- Universitätsmedizin, Berlin, Germany
16. Department of Dermatology, Heim Pál Children’s Hospital, Budapest, Hungary
17. Department of Dermatology, Boston Children’s Hospital, Boston, Massachusetts
18. Department of Dermatology, Medical College of Wisconsin, Milwaukee
19. Department of Pediatrics, Medical College of Wisconsin, Milwaukee
20. Paediatric Dermatology Department, Nottingham University Hospitals, Nottingham, England
21. Department of Dermatology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
22. Department of Dermatology, University of California, San Francisco Medical Center, San Francisco
23. Department of Pediatrics, University of California, San Francisco Medical Center, San Francisco
24. Department of Dermatology, Ghent University Hospital, Ghent, Belgium
25. First Department of Pediatrics, Agia Sofia Children’s Hospital, University of Athens Medical School, Athens, Greece
26. Psoriasis Center at the Department of Dermatology, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany
27. Department for Health Evidence, Radboud University, Nijmegen, the Netherlands