The physician and the emergency health service system.
D000488:Allied Health Personnel / Q000193:education; D000552:Ambulances; D003142:Communication; D004501:Education, Medical; D004632:Emergency Medical Services; D004636:Emergency Service, Hospital; D013502:General Surgery; D006268:Health Facilities; D006801:Humans; D010820:Physicians; D011787:Quality of Health Care; D012955:Societies, Medical; D014187:Transportation of Patients; D014481:United States