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|Prevalence and Predictors of Health Risk Behaviours During Early Pregnancy: Saskatoon Pregnancy and Health Study|
Canadian Journal of Public Health, Vol. 88, No. 6, 1997, pp. 375-379.
Examines the use of harmful substances during pregnancy. Harmful substances include alcohol, tobacco, caffeine, and psychoactive drugs. The research shows the relationship between socio-economical conditions and substance use.