the one randomized controlled study of<unk> s failed to show a mortality difference (out to 8yrs), although the<unk>  group did have a lower incidence of PE
A clinical trial of vena cava<unk> s in the prevention of pulmonary embolism in patients with proximal deep vein thrombosis. N Engl J Med. 1998 Feb 12;338(7):409-15
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