Abstract
References
1.
Bakketeig
L.S.
,
Hoffman
H.J.
, &
Sternthal
P.M.
(1978 ) Acta Obsietrica el Gynecologica Scandinavica Supplement 77
2.
Heady
J.A.
, &
Heasman
M.A.
(1959 ) Social and Biological Factors in Infant Mortality. Studies on Medical and Population Subjects No. 15. HMSO , London