RT Journal Article SR Electronic T1 Rheumatoid arthritis, methotrexate, and lymphoma: risk substitution, or cat and mouse with Epstein-Barr virus? JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 2573 OP 2575 VO 28 IS 12 A1 G Starkebaum YR 2001 UL http://www.jrheum.org/content/28/12/2573.abstract AB