Brazilian version of the "Primary Sjögren's Syndrome - Quality of Life questionnaire (PSS-QoL)": translation, cross-cultural adaptation and validation.

Background: The Primary Sjögren's Syndrome Quality of Life questionnaire (PSS-QoL) is the first specific instrument to assess health-related quality of life (HRQoL) in Sjögren's disease (SjD). The aim is to translate and cross-culturally adapt the PSS-QoL into Brazilian Portuguese and to evaluate its psychometric properties.

Methods: The original English version was translated into Brazilian Portuguese by two native Brazilians who were proficient in the English language.