Ankylosing Spondylitis

• Rheumatology Department, the Third Affiliated Hospital of Sun Yat-sen University — Guangzhou, Guangdong, China
• Rheumatology Department, the Third Affiliated Hospital of Sun Yat-sen University — Guangzhou, China

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

• Stanford University — Stanford, California, United States

• 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

• Inha University Hospital — Incheon, South Korea

• University Hospital Zurich, Centre on Aging and Mobility — Zurich, Canton of Zurich, Switzerland

• Department of Rheumatology, Charité - Campus Benjamin Franklin — Berlin, Germany

Not specified

Not specified

• Beijing, China
• Chengdu, China
• Guangzhou, China
• Hefei, China