title: Comment on van der Linden article.
mesh_terms: D005260:Female; D006680:HLA Antigens / Q000032:analysis*; D015796:HLA-B27 Antigen; D006801:Humans; D007249:Inflammation / Q000276:immunology; D008297:Male; D009426:Netherlands; D012446:Sacroiliac Joint; D013167:Spondylitis, Ankylosing / Q000276:immunology*
chemical_list: D006680:HLA Antigens; D015796:HLA-B27 Antigen