Laboratory diagnosis of heparin-associated thrombocytopenia and comparison of platelet aggregation test, heparin-induced activation test and platelet factor 4-heparin enzyme linked immunosorbent assay - Greinacher, A; Amiral, J; Dummel, V; Vissac, A; Kiefel, V; Mueller-Eckardt, C (Transfusion, 1994)