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Objective To develop a disease activity index for patients with primary Sjogren's syndrome (SS): the European League Against Rheumatism (EULAR) Sjogren's syndrome disease activity index (ESSDAI). Methods Thirty-nine SS experts participated in an international collaboration, promoted by EULAR, to develop the ESSDAI. Experts identified 12 organ-specific 'domains' contributing to disease activity. Fo
