Continuous intravenous heparin compared with intermittent subcutaneous heparin in the initial treatment of proximal-venous thrombosis - Hull, RD; Raskob, GE; Hirsh, J; Jay, RM; Leclerc, JR; Geerts, WH; Rosenbloom, D; Sackett, D; Gent, M (N Engl J Med, 1986)