Abstract

References
1.
Buck
C W
(1973 ) Journal of Chronic Diseases
26 , 101
2.
Miall
W E
Kensage
P
Khosla
T
(1967 ) Clinical Science
33 , 271
3.
Shinebourne
E A
Fayers
P
de Swiet
M
(1977 ) Archives of Disease in Childhood
52 , 807
4.
Zinner
S H
Levy
P S
Kass
E H
(1971 ) New England Journal of Medicine
284 , 401
