Serum CXCL13, BAFF, IL-21 and IL-22 levels are related to disease activity and lymphocyte profile in primary sjögren's syndrome - Loureiro-Amigo, J; Franco-Jarava, C; Perurena-Prieto, J; Palacio, C; Martínez-Valle, F; Soláns-Laqué, R (Clin Exp Rheumatol, 2021)