Abstract
References
1.
Mathews
M M
. (1964 ) Nature (Lond.)
203 , 1092 .
2.
Mathews-Roth
M M
Pathak
M A
Fitzpatrick
T B
Harber
L H
Kass
E H
. (1970 ) New Engl. J. Med.
282 , 1231 .
3.
Parish
J A
Pathak
M A
Fitzpatrick
T B
. (1971 ) New Engl. J. Med.
284 , 1257 .
4.
Pathak
M A
Fitzpatrick
T B
Frenk
E
. (1969 ) New Engl. J. Med.
280 , 1459 .