title: How long?
authors.forename: Elizabeth
authors.initials: E
authors.lastname: McIlwain
mesh_terms: D002309:Cardiology / Q000592:standards*; D004452:Echocardiography / Q000592:standards*; D017410:Practice Guidelines as Topic; D011871:Radiology / Q000592:standards*; D013997:Time Factors; D014481:United States; D016526:Workload / Q000592:standards*