RT Journal Article SR Electronic T1 Power of the database: an international approach to studying longterm rheumatoid arthritis therapy. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1877 OP 1880 VO 31 IS 10 A1 Marissa N Lassere A1 Kent R Johnson YR 2004 UL http://www.jrheum.org/content/31/10/1877.abstract AB