Abstract

References
1.
Banks
H. S.
(1939 ), Lancet (ii ), 921 .
2.
Brown
T. M.
(1937 ), Bull. Johns Hopkins Hosp. , 61 , 272 .
3.
Branham
S. E.
Rosenthal
S. M.
(1937 ), Pub. Health Rep. , 52 , 685 .
4.
Branham
S. E.
(1940 ), ibid. , 55 , 12 .
5.Clyde and Neely (1939 ) South M. J. , 32 , 594 .
