Abstract

References
1.
Corner
B D
. (1944 ) Arch. Dis. Childh.
19 , 68 .
2.
Dancaster
C P
Jackson
W P U
. (1960 ) S. Afr. med. J.
35 , 890 .
3.
Davis
L R
Marten
R H
Sarkany
I
. (1960 ) Brit. med. J.
ii , 1426 .
