Abstract

Get full access to this article
View all access options for this article.
References
1.
Scales
J T
Hopkins
L A
Lancet , ii , p 885 (1971 ).
2.
Crockford
G W
Crowder
M
Prestidge
S P
Brit. J Industr. Med , 29 , pp 378 –386 (1972 ).
3.
Redfern
S J
Jeneid
P A
Gillingham
M E
Lunn
Fletcher H
Lancet , ii , pp 277 –280 (1972 ).
