RT Journal Article SR Electronic T1 Authors' response JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 690 OP 690 DO 10.1136/oemed-2012-100695 VO 69 IS 9 A1 Søyseth, Vidar A1 Johnsen, Helle Laier A1 Kongerud, Johny YR 2012 UL http://oem.bmj.com/content/69/9/690.1.abstract AB