Subcutaneous recombinant hirudin (HBW 023) versus intravenous sodium heparin in treatment of established acute deep vein thrombosis of the legs: a multicentre prospective dose-ranging randomized trial - Schiele, F; Lindgaerde, F; Eriksson, H; Bassand, J-P; Wallmark, A; Hansson, P-O; Grollier, G; Sjo, M; Moia, M; Camez, A; Smyth, V; Walker, M; for the International Multicentre Hirudin Study Group (Thromb Haemost, 1997)