Presence of rheumatoid factor and antibodies to citrullinated peptides in systemic lupus erythematosus. Issue 2 (12th January 2005) - Hoffman, I E A; Peene, I; Cebecauer, L; Isenberg, D; Huizinga, T W J; Union, A; Meheus, L; De Bosschere, K; Hulstaert, F; Veys, E M; De Keyser, F