title: Ankylosing spondylitis and its early diagnosis.
mesh_terms: D000328:Adult; D002648:Child; D006680:HLA Antigens / Q000302:isolation & purification; D006650:Histocompatibility Testing; D006801:Humans; D013167:Spondylitis, Ankylosing / Q000175:diagnosis / Q000235:genetics
chemical_list: D006680:HLA Antigens