patients were allocated to nine groups : typical ankylosing spondylitis , ankylosing spondylitis with moderate involvement without peripheral arthritis , ankylosing spondylitis with moderate involvement and with peripheral arthritis , juvenile chronic arthritis , reiter 's syndrome , yersinia arthritis , arthropathies of inflammatory bowel disease , psoriatic arthritis , seronegative and seropositive rheumatoid arthritis .
C0003864
arthritis
C0003872
psoriatic arthritis