Effects of helicopter service on survival after trauma. Design of study predisposed to type II error.
Maclean
A D
AD
Kirk
C J
CJ
Coats
T J
TJ
Cross
F W
FW
D017732:Air Ambulances; D004632:Emergency Medical Services; D006801:Humans; D008131:London / Q000453:epidemiology; D012107:Research Design; D014947:Wounds and Injuries / Q000401:mortality*