title: Sjögren's syndrome complicated with retroperitoneal Non-Hodgkin's lymphoma: A case of an elderly woman during methotrexate treatment, treated with R-CHOP.
authors.affiliation: Department of Rheumatology, Chronic Fatigue Unit, Hospital Universitario Joan XXIII de Tarragona, Tarragona, Spain.
authors.forename: Rami
authors.initials: R
authors.lastname: Qanneta