RT Journal Article SR Electronic T1 Correction JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 520 OP 520 DO 10.1136/oemed-2012-100979corr1 VO 70 IS 7 YR 2013 UL http://oem.bmj.com/content/70/7/520.2.abstract AB