Occupational Health CommitteeBr Med J 1980; 280 doi: https://doi.org/10.1136/bmj.280.6212.499 (Published 16 February 1980) Cite this as: Br Med J 1980;280:499
Log in using your username and password
Log in through your institution
Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
Sign up for a free trial