title: Historical review of emergency medical services, EMT roles, and EMT utilization in emergency departments.
mesh_terms: D000488:Allied Health Personnel / Q000706:statistics & numerical data*; D004632:Emergency Medical Services / Q000266:history*; D004634:Emergency Medical Technicians / Q000193:education / Q000706:statistics & numerical data*; D004636:Emergency Service, Hospital; D049673:History, 20th Century; D006801:Humans; D000078329:Workforce