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The bone bridge significantly affects the decrease in bone mineral density measured with quantitative computed tomography in ankylosing spondylitis | PLOS ONE
Ankylosing spondylitis (a type of arthritis) worse with low vitamin D – Jan 2012 | VitaminDWiki
Cervical spondylosis - Symptoms and causes - Mayo Clinic
Ankylosing spondylitis: MedlinePlus Genetics
Ankylosing spondylitis prevalence increased 1.5 X in a decade (probably Vitamin D) 2017 | VitaminDWiki
Overview Rheumatoid Arthritis and vitamin D | VitaminDWiki