Psoriatic Arthritis (PsA)

• Sint Maartenskliniek Nijmegen — Nijmegen, Gelderland, Netherlands
• Maastricht UMC+ — Maastricht, Limburg, Netherlands
• Elisabeth-TweeSteden Ziekenhuis Tilburg — Tilburg, North Brabant, Netherlands
• Medisch Spectrum Twente — Enschede, Overijssel, Netherlands

• Royal National Hospital for Rheumatic Diseases — Bath, Somerset, United Kingdom

• University Hospital, Bonn — Bonn, North Rhine-Westphalia, Germany

• The Danish Hospital for Rheumatic Diseases — Sønderborg, Denmark
• Skåne University Hospital — Lund, Sweden

• Department of Rheumatology — Bonn, North Rhine-Westphalia, Germany

• UT Southwestern Medical Center — Dallas, Texas, United States

• Rheumatology Hopital Saint Antoine — Paris, France

Not specified

• Medical College of Wisconsin/Froedtert Hosptial — Milwaukee, Wisconsin, United States

• Pender Community Health Centre — Vancouver, British Columbia, Canada