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Serum IL-18 concentrations in patients with Sjögren's syndrome (SS) and relationship with the presence of anti-SSA/Ro and anti-SSB/La antibodies. Box–whisker plots showing serum IL-18 concentration in patients with SS compared with patients with rheumatoid arthritis (RA) and normal healthy subjects (NHS) (a), and in patients with SS who are positive or negative for anti-SSA/Ro (b) or anti-SSB/La antibodies (c). See text for statistical analysis.
