Abstract

References
1.
Crafoord
C
Nylin
G
. (1945 ) J. thorac. Surg . 14 , 347 .
2.
Owens
J C
Swan
H
. (1963 ) J. cardiovasc. Surg. (Torino)
4 , 816 .
3.
Sellors
T H
Hobsley
M
. (1963 ) Lancet
i , 1387 .
4.
Walker
R M
Haxton
H
. (1954 ) Brit. J. Surg . 42 , 26 .
