RT Journal Article SR Electronic T1 How important is personal exposure assessment in the epidemiology of air pollutants? JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 143 OP 144 DO 10.1136/oem.60.2.143-a VO 60 IS 2 A1 Kromhout, H A1 van Tongeren, M YR 2003 UL http://oem.bmj.com/content/60/2/143.2.abstract AB