title: A case-control study of juvenile- and adult-onset ankylosing spondylitis.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D005260:Female; D006680:HLA Antigens / Q000032:analysis; D015796:HLA-B27 Antigen; D006801:Humans; D008297:Male; D008875:Middle Aged; D011627:Puberty; D012189:Retrospective Studies; D012737:Sex Factors; D013167:Spondylitis, Ankylosing / Q000175:diagnosis* / Q000209:etiology
chemical_list: D006680:HLA Antigens; D015796:HLA-B27 Antigen