RT Journal Article SR Electronic T1 Occupational asthma JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 151 OP 151 DO 10.1136/oem.2007.034181 VO 65 IS 3 A1 Paul Cullinan YR 2008 UL http://oem.bmj.com/content/65/3/151.abstract AB