Antiphospholipid antibodies and thrombosis in systemic lupus erythematosus: comparison of three lupus anticoagulant assays and anticardiolipin ELISA in 188 patients - Jouhikainen, T; Julkunen, H; Vaarala, O; Leirisalo-Repo, M; Stephans-son, E; Vahtera, E; Palosuo, T; Myllyla, G (Blood Coagul Fibrinol, 1992)