RT Journal Article SR Electronic T1 Tracheal bronchus JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 783 OP 783 DO 10.1503/cmaj.080280 VO 180 IS 7 A1 Shih, Fu-Chieh A1 Lee, Wei-Jing A1 Lin, Hung-Jung YR 2009 UL http://www.cmaj.ca/content/180/7/783.abstract