RT Journal Article SR Electronic T1 The authors' reply JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 717 OP 718 DO 10.1136/oem.47.10.717-a VO 47 IS 10 YR 1990 UL http://oem.bmj.com/content/47/10/717.2.abstract AB