Diagnostic flow of suspected patients of Sjögren’s syndrome. USF: unstimulated salivary flow; ST: Schirmer test; anti-SSA/SSB +: anti-SSA and/or anti-SSB positive; anti-SSA/SSB -: anti-SSA and/or anti-SSB. negative; Biopsy +: score focus ≥ 1; Biopsy -: focus score < 1; no SS: no Sjögren’s. syndrome; pSS: primary Sjögren’s syndrome according to the American European. Consensus Group 2002.