A comparative randomized trial of heparin versus streptokinase in the treatment of acute proximal venous thrombosis: An interim report of a prospective trial - Elliot, M S; Immelman, E J; Jeffery, P; Benatar, S R; Funston, M R; Smith, J A; Shepstone, B J; Ferguson, A D; Jacobs, P; Walker, W; Louw, J H (Br J Surg, 1979)