Abstract

References
1.
Bennett
A E
Garrad
J
Halil
T
. (1970 ) Brit. med. J.
iii , 762 .
2.
Garrad
J
Bennett
A E
. (1971 ) Brit. J. prev. soc. Med.
25 , 97 .
3.
Harris
A I
. (1971 ) Handicapped and Impaired in Great Britain . HMSO , London .
