The helicopter and the EMS system.
Hankins
D G
DG
Frascone
R J
RJ
D000401:Aircraft; D004632:Emergency Medical Services / Q000639:trends*; D006801:Humans; D008910:Minnesota; D014187:Transportation of Patients / Q000639:trends*; D014193:Trauma Centers / Q000639:trends; D014947:Wounds and Injuries / Q000628:therapy*