1. Leeds Institute of Molecular Medicine, University of LeedsLeedsUK
2. Leeds Musculoskeletal Biomedical Research Unit, University of LeedsLeedsUK
3. University of Toronto and Toronto Western Hospital, TorontoOntarioCanada
4. VU Medical CentreAmsterdamThe Netherlands
5. St. Vincent's University Hospital, University CollegeDublinIreland
6. University of CaliforniaSan Diego
7. Portola ValleyCalifornia
8. Swedish Medical Center and University of Washington School of MedicineSeattle
9. Hôpital Universitaire de GenèveGenèveSwitzerland
10. Queen Elizabeth II Health Sciences Centre, Dalhousie UniversityHalifax, Nova ScotiaCanada
11. University of MoliseCampobassoItaly
12. Italian Association of Psoriatic PatientsRomeItaly
13. Medizinische Klinik und Poliklinik IV, Ludwig‐Maximilians‐UniversityMunichGermany
14. Hôpital Bicêtre, Assistance Publique‐Hôpitaux de ParisLe Kremlin‐BicêtreFrance
15. Hospital Universitario Central de AsturiasOviedo, AsturiasSpain