Age‐related clinical heterogeneity and peripheral T cell profile alterations in primary Sjögren's disease: A retrospective study of 5778 patients. - Ning, Yuan; Feng, Ruiling; Zhang, Kai; Han, Yipeng; Wang, Ruoyi; Li, Guangwen; Jin, Yuebo; He, Jing (Rheumatology & Autoimmunity, 2026)