title: Variations in the use of cardiac procedures: what is the explanation?
authors: N R
authors: NR
authors: Every
authors: J L
authors: JL
authors: Ritchie
mesh_terms: D006328:Cardiac Catheterization / Q000706:statistics & numerical data*; D006297:Health Services Accessibility; D006787:Hospitals, Veterans; D006801:Humans; D017202:Myocardial Ischemia / Q000601:surgery*; D010818:Practice Patterns, Physicians'; D014481:United States