A randomized controlled trial of a low-molecular weight heparin (enoxaparin) to prevent deep-vein thrombosis in patients undergoing elective hip surgery - Turpie, A G G; Levine, M N; Hirsh, J; Carter, C J; Jay, R M; Powers, P J; Andrew, M; Hull, R D; Gent, M (N Engl J Med, 1986)