RT Journal Article SR Electronic T1 Practical Occupational Medicine JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 432 OP 432 DO 10.1136/oem.52.6.432-a VO 52 IS 6 A1 T C Aw YR 1995 UL http://oem.bmj.com/content/52/6/432.2.abstract AB