title: Variation and inappropriateness are not the same.
authors.forename: D H
authors.initials: DH
authors.lastname: Mark
mesh_terms: D000792:Angiography / Q000706:statistics & numerical data*; D003331:Coronary Vessels; D006296:Health Services / Q000706:statistics & numerical data*; D006300:Health Services Misuse / Q000706:statistics & numerical data*; D006801:Humans; D010818:Practice Patterns, Physicians'