Salivary gland ultrasonography in primary Sjögren's syndrome from diagnosis to clinical stratification: a multicentre study.

After the analysis based on one side among diverse groups, data showed a trend to have significant differences between the first and second stages and between the first and third stages ( p =0.042, 0.002, respectively) but not between the second and third stages ( p =0.345) (Fig. 3 ).

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