RT Journal Article SR Electronic T1 Croup in children JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1317 OP 1323 DO 10.1503/cmaj.121645 VO 185 IS 15 A1 Candice L. Bjornson A1 David W. Johnson YR 2013 UL http://www.cmaj.ca/content/185/15/1317.abstract AB