RT Journal Article SR Electronic T1 Emergency battlefield cricothyrotomy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1133 OP 1135 DO 10.1503/cmaj.080036 VO 178 IS 9 A1 Macdonald, John C. A1 Tien, Homer C.N. YR 2008 UL http://www.cmaj.ca/content/178/9/1133.abstract AB