RT Journal Article SR Electronic T1 Increased need for tracheal intubation for croup in relation to bacterial tracheitis JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 532a OP 533 VO 129 IS 6 A1 Isles, A. F. A1 Newth, C. J. YR 1983 UL http://www.cmaj.ca/content/129/6/532a.abstract