RT Journal Article SR Electronic T1 Macrophage activation syndrome and etanercept in children with systemic juvenile rheumatoid arthritis. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 623 OP 623 VO 31 IS 3 A1 Haroon Sawar A1 Luis R Espinoza A1 Abraham Gedalia YR 2004 UL http://www.jrheum.org/content/31/3/623.abstract AB