Abstract

References
1.
Brock
R C
. (1957 ) Guy's Hosp. Rep.
106 , 221 .
2.
Kirklin
J
Ellis
F H
. (1961 ) Circulation
24 , 739 .
3.
Morrow
A G
Brockenbrough
E C
. (1961 ) Ann. Surg.
154 , 181 .
