Measurement of fatigue and discomfort in primary Sjögren's syndrome using a new questionnaire tool

Abstract
Objective. Fatigue is a prominent symptom in primary Sjögren's syndrome (PSS). We set out to compare existing instruments and a new tool for measuring fatigue and general discomfort in PSS, with systemic lupus erythematosus (SLE), rheumatoid arthritis (RA) and healthy controls.