title: The challenge of justifying services.
authors: L.A. County-USC Medical Center, Los Angeles, USA.
authors: D
authors: D
authors: Rasumoff
mesh_terms: D003625:Data Collection; D004282:Documentation; D004632:Emergency Medical Services / Q000191:economics / Q000592:standards* / Q000706:statistics & numerical data; D006801:Humans; D010043:Outcome and Process Assessment, Health Care / Q000379:methods*; D011787:Quality of Health Care; D014481:United States; D014600:Utilization Review