Different intensities of oral anticoagulant therapy in the treatment of proximal-vein thrombosis - Hull, R; Hirsh, J; Jay, R; Carter, C; England, C; Gent, R N M; Trupie, A G G; McLoughlin, D; Didd, P; Thomas, M; Raskab, G; Ockelford, P (N Engl J Med, 1982)