Abstract
References
1.
Reid
D D
Cornfield
J
Markush
R E
Seigel
D
Pedersen
E
Haenszel
W
(1966 ) Nat. Cancer Inst. Mongr. No 19, p 321
2.
Reid
D D
Holland
W W
Humerfelt
S
Rose
G
(1966 ) Lancet
i , 614
3.
Cockburn
W C
Pečenka
J
Sundaresan
T K
(1966 ) Bull. Wld Hlth Org.
34 , 223
4.
Adams
M J T
Spicer
C C
(1965 ) Lancet
ii , 732
5.
Ellwood
D C
Keppie
J
Smith
H
(1967 ) Brit. J. exp. Path.
48 (in press)