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  1. Ankylosing Spondylitis. National Institute of Arthritis and Muskoskeletal and Skin Diseases. https://www.niams.nih.gov/health-topics/ankylosing-spondylitis
  2. Overview of Ankylosing Spondylitis. Spondylitis Association of America. https://www.spondylitis.org/Ankylosing-Spondylitis
  3. Ankylosing Spondylitis. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/ankylosing-spondylitis/symptoms-causes/syc-20354808
  4. Axial Spondloarthritis. Arthritis Foundation. https://www.arthritis.org/about-arthritis/types/ankylosing-spondylitis/