PT  - JOURNAL ARTICLE
AU  - David T Felson
TI  - Whither the ACR20?
DP  - 2004 May 01
TA  - The Journal of Rheumatology
PG  - 835--837
VI  - 31
IP  - 5
4099  - http://www.jrheum.org/content/31/5/835.short
4100  - http://www.jrheum.org/content/31/5/835.full
SO  - J Rheumatol2004 May 01; 31