An exploratory trial of two dosages of a novel synthetic thrombin inhibitor (Napsagatran, Ro 46-6240) compared with unfractionated heparin for treatment of proximal deep-vein thrombosis. Results of the European Multicenter ADVENT trial - Bounameaux, H; Ehringer, H; Hulting, J; Rasche, H; Rapold, HJ; Zultak, M (Thromb Haemost, 1997)