Arthritis, Psoriatic

• Birmingham, Alabama, United States
• Huntsville, Alabama, United States
• Los Angeles, California, United States
• San Diego, California, United States

• Pfizer Investigational Site — Toerwang-Samerberg, Germany

• Pfizer Investigational Site — München, Germany

• Brigham and Women's Hospital — Boston, Massachusetts, United States

• Lillehammer Hospital for Rheumatic Diseases — Lillehammer, Oppland, Norway

Not specified

• Site Reference ID/Investigator# 29724 — Ansan, South Korea
• Site Reference ID/Investigator# 53586 — Ansan, South Korea
• Site Reference ID/Investigator# 29729 — Bucheon-si, South Korea
• Site Reference ID/Investigator# 29009 — Bucheon-si, South Korea

• Huntsville, Alabama, United States
• La Jolla, California, United States
• Upland, California, United States
• Aventura, Florida, United States

• Macon, Georgia, United States
• Boise, Idaho, United States
• Normal, Illinois, United States
• Indianapolis, Indiana, United States

• Pfizer Investigational Site — Leuven, Belgium