Different intensities of oral anticoagulation therapy in the treatment of proximalvein thrombosis - Hull, R; Hirsh, J; Jay, R; Carter, C; England, C; Gent, M; Turpie, AGG; McLoughlin, D; Dodd, P; Thomas, M; Raskob, G; Ockelford, P (N Engl J Med, 1982)