RT Journal Article SR Electronic T1 Effect of ethnicity on disease activity in systemic lupus erythematosus. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 962 OP 963 VO 32 IS 5 A1 Jaime Calvo-Alén A1 Luis M Vilá A1 John D Reveille A1 Graciela S Alarcón YR 2005 UL http://www.jrheum.org/content/32/5/962.abstract AB