The SS/SLE patients had an earlier age of onset, higher incidences of arthritis, leucopenia, proteinuria and low complement levels, and lower incidences of xerostomia and interstitial lung disease compared with Primary Sjogren's Syndrome patients. Pub Med Int J Rheum Dis. 2013 Apr;16(2):173-7. (Also see: Sjogren's Syndrome and Lupus in Overlap)
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