Lepirudin (recombinant hirudin) for parenteral anticoagulation in patients with heparin-induced thrombocytopenia - Greinacher, A; Janssens, U; Berg, G; Böck, M; Kwasny, H; Kemkes-Matthes, B; Eichler, P; Völpel, H; Pötzsch, B; Luz, M; for the Heparin-associated Thrombocytopenia Study (HAT) Investigators. (Circulation, 1999)