title: Observational studies cannot justify the inferior vena cava filter.
authors.affiliation: Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Md.
authors.forename: Vinay
authors.initials: V
authors.lastname: Prasad
mesh_terms: D006801:Humans; D011655:Pulmonary Embolism / Q000628:therapy*; D016306:Vena Cava Filters / Q000706:statistics & numerical data*