RT Journal Article SR Electronic T1 Studies in occupational epidemiology and the risk of overadjustment JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 787 OP 787 DO 10.1136/oem.2006.028787 VO 63 IS 12 A1 E M de Croon YR 2006 UL http://oem.bmj.com/content/63/12/787.1.abstract AB