Abstract
References
1.
Pond
D A
. (1961 ) Brit. med. J.
ii , 1377 , 1454 .
2.
Slater
E
Beard
A W
. (1963 ) Brit. J. Psychiat.
109 , 95 .
3.
Williams
D
. (1956 ) Brain
79 , 29 .