title: The risk of ankylosing spondylitis in HLA-B27 positive individuals: a reappraisal.
mesh_terms: D004812:Epidemiologic Methods; D006680:HLA Antigens; D015796:HLA-B27 Antigen; D006801:Humans; D012306:Risk; D013167:Spondylitis, Ankylosing / Q000453:epidemiology / Q000276:immunology*
chemical_list: D006680:HLA Antigens; D015796:HLA-B27 Antigen