1. Maternal smoking during pregnancy and expenditures of neonatal health care;G Oster;Am J Prev Med 4,1988
2. Maternal smoking and congenital heart defects in the Baltimore-Washington infant study;CJ Alverson;Pediatrics 127,2011
3. Cigarette smoking, nicotine and pregnancy;KO Haustein;Int J Clin Pharmacol Ther,1999
4. Pregnancy and smoking;WJ Millar;Health Rep 15,2004
5. Alberta Health (2011) Alberta reproductive health pregnancies & Births, table update 2011. Available: http://www.health.alberta.ca/documents/reproductive-health-2011.pdf. Accessed 17 July 2012.