RT Journal Article SR Electronic T1 The ghost of methods past: exposure assessment versus job–exposure matrix studies JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 2 OP 3 DO 10.1136/oem.2009.054585 VO 68 IS 1 A1 Igor Burstyn YR 2011 UL http://oem.bmj.com/content/68/1/2.abstract AB