Spondylitis, Ankylosing

• Tucson Orthopaedic Research Center — Tucson, Arizona, United States
• University of Arizona — Tucson, Arizona, United States
• California Pacific Medical Center — San Francisco, California, United States
• Illinois Bone & Joint Institute, Ltd. — Glenview, Illinois, United States

• CHU Brugmann - Site Horta — Brussels, Bruxelles-capitale, Région de, Belgium
• ASZ Aalst — Aalst, Belgium
• Algemeen Stedelijk Ziekenhuis — Aalst, Belgium
• Onze Lieve Vrouw Ziekenhuis Aalst — Aalst, Belgium

• Research Site — Altenholz, Germany
• Research Site — Bad Neuenahr-Ahrweiler, Germany
• Research Site — Berlin, Germany
• Research Site — Berlin, Germany

• Dokuz Eylul University School of Physical Therapy and Rehabilitation — Izmir, Turkey (Türkiye)

• ULB Hopital Erasme, Service de Rheumatology — Brussels, Belgium
• Eurohospital — Plovdiv, Bulgaria
• UMHAT Kaspela EOOD — Plovdiv, Bulgaria
• Medical Center "Teodora", EOOD — Rousse, Bulgaria

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

Not specified

Not specified

• 7 — Los Angeles, California, United States
• 1 — Chapel Hill, North Carolina, United States
• 3 — Durham, North Carolina, United States
• 500 — Maastricht, Netherlands

• North-Western State Medical University n.a. I.I.Mechnikov — Saint Petersburg, Russia