Letter: Implications of W27 screening.
D005260:Female; D006680:HLA Antigens / Q000032:analysis*; D006649:Histocompatibility Antigens / Q000032:analysis*; D006801:Humans; D008297:Male; D013167:Spondylitis, Ankylosing / Q000175:diagnosis*
D006680:HLA Antigens; D006649:Histocompatibility Antigens