Cognitive impairment in primary Sjögren’s syndrome: a case-control study - Garza Martínez, M.J.; Treviño Castro, M.A.; Cárdenas, A.; Solís, C.V.; Vera Pineda, Raymundo; Riega Torres, Janett Carmen Luzmila; Skinner Taylor, C. M.; Galarza Delgado, Dionicio Ángel (BMJ Publ. Group., 2020)