RT Journal Article SR Electronic T1 Assessing historical exposure is like solving a mystery JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 429 OP 430 DO 10.1136/oem.2004.019158 VO 62 IS 7 A1 H Kromhout YR 2005 UL http://oem.bmj.com/content/62/7/429.1.abstract AB