Influence of sulphasalazine, methotrexate, and the combination of both on plasma homocysteine concentrations in patients with rheumatoid arthritis
Cees J Haagsma, Henk J Blom, Piet L C M van Riel, Martin A van’t Hof, Belinda A J Giesendorf, Dinny van Oppenraaij-Emmerzaal, Levinus B A van de Putte
Annals of the Rheumatic Diseases Feb 1999, 58 (2) 79-84; DOI: 10.1136/ard.58.2.79