1. Department of Dermatology, Radboud University, Nijmegen, the Netherlands
2. Department of Dermatology, Northwestern University, Chicago, Illinois3Department of Pediatrics, Northwestern University, Chicago, Illinois
3. Department of Pediatric Medicine, Dermatology Section, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
4. Department of Dermatology, Mayo Clinic, Rochester, Minnesota
5. Department of Dermatology, Rady Children’s Hospital San Diego, University of California, San Diego7Department of Pediatrics, Rady Children’s Hospital San Diego, University of California, San Diego
6. Department of Dermatology, Phoenix Children’s Hospital, Phoenix, Arizona9now with the Department of Dermatology, University of California, Los Angeles
7. Department of Dermatology, University of Massachusetts Medical School, Worcester
8. Department of Dermatology and Allergy, Herlev-Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark
9. Department of Dermatology, Hôpital Victor Dupouy Argenteuil, Argenteuil, France
10. Department of Dermatology, St Louis University School of Medicine, St Louis, Missouri14Department of Pediatrics, St Louis University School of Medicine, St Louis, Missouri
11. Psoriasis Research and Treatment Center, Charité-Universitäts-Medizin, Berlin, Germany
12. Department of Dermatology, Heim Pál Children’s Hospital, Budapest, Hungary
13. Department of Dermatology, Boston Children’s Hospital, Boston, Massachusetts
14. Department of Dermatology, Medical College of Wisconsin, Milwaukee19Department of Pediatrics, Medical College of Wisconsin, Milwaukee
15. Paediatric Dermatology Department, Nottingham University Hospitals, Nottingham, England
16. Department of Dermatology, Hospital de la Sanat Creu i Sant Pau, Barcelona, Spain
17. Department of Dermatology, University of California, San Francisco Medical Center, San Francisco23Department of Pediatrics, University of California, San Francisco Medical Center, San Francisco
18. Department of Dermatology, Ghent University Hospital, Ghent, Belgium
19. First Department of Pediatrics, Agia Sofia Children’s Hospital, University of Athens Medical School, Athens, Greece
20. Psoriasis Center at the Department of Dermatology, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany
21. Department for Health Evidence, Radboud University, Nijmegen, the Netherlands