Continuous intravenous heparin compared with intermittent subcutaneous heparin in the initial treatment of proximal vein thrombosis - Hull, R; Raskob, G; Hirsh, J; Jay, RM; Leclerc, JR; Geerts, WH; Rosenbloom, D; Sackett, DL; Anderson, C; Harisson, L; Gent, M (N Engl J Med, 1986)