title: Blood groups in ankylosing spondylitis.
mesh_terms: D000704:Analysis of Variance; D001789:Blood Group Antigens; D006801:Humans; D009174:Mycoplasma; D009664:Norway; D012204:Rh-Hr Blood-Group System; D013167:Spondylitis, Ankylosing / Q000097:blood*
chemical_list: D001789:Blood Group Antigens; D012204:Rh-Hr Blood-Group System