title: Ankylosing spondylitis and multiple sclerosis: a possible association.
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000150:complications* / Q000453:epidemiology; D012189:Retrospective Studies; D013167:Spondylitis, Ankylosing / Q000150:complications* / Q000453:epidemiology; D014481:United States