title: Assessment of Medicare's imaging efficiency measure for emergency department patients with atraumatic headache.
authors.forename: Susan L
authors.initials: SL
authors.lastname: Arday
authors.forename: Shaheen
authors.initials: S
authors.lastname: Halim
authors.forename: Karen T
authors.initials: KT
authors.lastname: Nakano
mesh_terms: D004636:Emergency Service, Hospital / Q000592:standards*; D005260:Female; D006261:Headache / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D006278:Medicare / Q000592:standards*; D011859:Radiography