Spondylitis, Ankylosing

• Medizinische Universitätsklinik Innere Medizin — Tübingen, Baden-Wurttemberg, Germany
• Praxis Dr. Jacki — Tübingen, Baden-Wurttemberg, Germany
• Praxis Dr. Manger — Bamberg, Bavaria, Germany
• Praxis Dr. Ochs — Bayreuth, Bavaria, Germany

• Seoul National University Bundang Hospital — Seongnam-si, Gyeonggi-do, South Korea

• 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

• Far Eastern Memorial Hospital — Taipei County, Taiwan

• 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

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

• Inha University Hospital — Incheon, South Korea