RT Journal Article SR Electronic T1 Occupational asthma: an approach to diagnosis and management JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 867 OP 871 VO 168 IS 7 A1 Tarlo, Susan M. A1 Liss, Gary M. YR 2003 UL http://www.cmaj.ca/content/168/7/867.abstract