title: Extra-articular manifestations as markers of disease in seronegative spondylarthropathies.
mesh_terms: D016918:Arthritis, Reactive / Q000175:diagnosis*; D001528:Behcet Syndrome / Q000175:diagnosis*; D006801:Humans; D007410:Intestinal Diseases / Q000175:diagnosis; D011565:Psoriasis / Q000175:diagnosis*; D013167:Spondylitis, Ankylosing / Q000175:diagnosis*