RT Journal Article SR Electronic T1 Textbook of Clinical Occupational and Environmental Medicine JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 559 OP 560 DO 10.1136/oem.52.8.559-a VO 52 IS 8 A1 P G Blain YR 1995 UL http://oem.bmj.com/content/52/8/559.2.abstract AB