Abstract

References
1.
Gould
A P
(1884 ) Trans, clin. Soc. Lond.
17 , 104 .
2.
Hoobler
S W
(1942 ) New Engl. J. Med.
226 , 942 .
3.
Shucksmith
H S
(1963 ) Brit. med. J.
ii , 734 .
4.
Smith
G W
(1941 ) Nav. med. Bull., Wash.
39 , 551 .
5.
Symonds
C P
(1927 ) Brain
50 , 259 .
6.
Yates
A G
Guest
D
(1928 ) Lancet
ii , 225 .
