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