Trauma center utilization in Illinois: a report from the Illinois trauma study.
D000552:Ambulances; D004632:Emergency Medical Services / Q000458:organization & administration*; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005069:Evaluation Studies as Topic; D007087:Illinois; D012040:Regional Health Planning; D014193:Trauma Centers / Q000706:statistics & numerical data*