Arthritis, Psoriatic

• Encinitas, California, United States
• La Jolla, California, United States
• San Diego, California, United States
• Denver, Colorado, United States

• NYU Hospital for Joint Diseases — New York, United States
• Bellevue Hospital — New York, United States

• Site Reference ID/Investigator# 35035 — Aachen, Germany
• Site Reference ID/Investigator# 64288 — Aachen, Germany
• Site Reference ID/Investigator# 35509 — Ahlen, Germany
• Site Reference ID/Investigator# 53118 — Ahrensburg, Germany

• Complejo Hospitalario Universitario A Coruna — A Coruña, A Coruna, Spain
• Hospital Arquitecto Marcide-Novoa Santos — Ferrol, A Coruna, Spain
• Hospital de Elche — Elche, Alicante, Spain
• Hospital Comarcal Villajoyosa — Villajoyosa, Alicante, Spain

• Birmingham, Alabama, United States
• Wheaton, Maryland, United States
• Lake Success, New York, United States
• Rochester, New York, United States

• Kirk Barber Research — Calgary, Alberta, Canada
• Winnipeg Clinic Dermatology Research — Winnipeg, Manitoba, Canada
• Nexus Clinical Research — St. John's, Newfoundland and Labrador, Canada
• Dermatrials Research — Hamilton, Ontario, Canada

• University of Alexandria — Alexandria, Alexandria Governorate, Egypt

• University of Alexandria — Alexandria, Alexandria Governorate, Egypt

Not specified

• Site Reference ID/Investigator# 52144 — Bludenz, Austria
• Site Reference ID/Investigator# 44915 — Fürstenfeld, Austria
• Site Reference ID/Investigator# 44910 — Gloggnitz, Austria
• Site Reference ID/Investigator# 44914 — Graz, Austria