title: No free ride. Physician certificates and ambulance transport.
authors: H A
authors: HA
authors: Kirkwood
mesh_terms: D000552:Ambulances / Q000191:economics*; D004635:Emergency Medicine / Q000331:legislation & jurisprudence*; D006278:Medicare / Q000331:legislation & jurisprudence*; D010414:Pennsylvania; D014481:United States