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1. Refsum H. Folate, vitamin B12 and homocysteine in relation to birth defects and pregnancy outcome. British Journal of Nutrition 2001; 85(Suppl. 2): S109-13.

2. Allen L. How common is vitamin B-12 deficiency? American Journal of Clinical Nutrition 2009; 89(Suppl.): 693S-6S.

3. Mason JB, Dickstein A, Jacques PF, et al. A temporal association between folic acid fortification and an increase in colorectal cancer rates may be illuminating important biological principles: A hypothesis. Cancer Epidemiology Biomarkers and Prevention 2007; 16(7): 1325-9.

4. Morris MS, Jacques PF, Rosenberg IH, et al. Folate and vitamin B12 status in relation to anemia, macrocytosis, and cognitive impairment in older Americans in the age of folic acid fortification. American Journal of Clinical Nutrition 2007; 85(1): 193-200.

5. Institute of Medicine. DRI Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. Washington, D.C.: National Academy Press, 1998.

6. Berry RJ, Mulinare J, Hamner H. Folic acid fortification. In: LB Bailey, ed.Folate in Health and Disease. Second edition. Boca Raton, Florida: CRC Press, Taylor and Francis Group, 2010.

7. Bryan S, St-Denis M, Wojtas D. Canadian Health Measures Survey: Clinic operations and logistics. Health Reports 2007; 18(Suppl.): 53-70.

8. Day B, Langlois R, Tremblay et al. Canadian Health Measures Survey: Ethical, legal and social issues. Health Reports 2007; 18(Suppl.): 37-51.

9. Tremblay M, Wolfson M, Gorber SC. Canadian Health Measures Survey: Rationale, background and overview. Health Reports 2007; 18(Suppl.): 7-20.

10. Statistics Canada. Questionnaire(s) and Reporting Guide(s) - Canadian Health Measures Survey (CHMS). Available at: http://www.statcan.gc.ca/cgi-bin/imdb/p2SV.pl?Function=getInstrumentLink&SurvItem_Id=9353&Query_Id=10263&Query=instance&lang=
en&db=imdb&adm=8&dis=2. Accessed August 15, 2011.

11. Health Canada. Drug Product Database. Available at: http://www.hc-sc.gc.ca/dhp-mps/prodpharma/databasdon/index-eng.php. Accessed August 15, 2010.

12. Health Canada. Licensed Natural Health Products Database.  Available at: http://www.hc-sc.gc.ca.proxy.bib.uottawa.ca/dhp-mps/prodnatur/applications/licen-prod/lnhpd-bdpsnh_data_extract-eng.php. Accessed August 15, 2010.

13. Statistics Canada. Income Trends in Canada: 1980-2003.  Available at: http://www.statcan.gc.ca/pub/13f0022x/00003/notedef/5801170-eng.htm#famsize. Accessed March 29, 2010.

14. Statistics Canada. Canadian Health Measures Survey (CHMS) Cycle 1 Wave 1 Derived Variable (DV) Specifications.  Available at: http://www.statcan.gc.ca/imdb-bmdi/document/5071_D3_T9_V2-eng.pdf. Accessed April 18, 2011.

15. Health Canada. Canadian Guidelines for Body Weight Classification (Catalogue H49-179) Ottawa: Health Canada, 2003.

16. Cole TJ, Bellizzi MC, Flegal KM, et al. Establishing a standard definition for child overweight and obesity worldwide: International survey. British Medical Journal 2000; 320(7244): 1240-3.

17. Stabler S. Clinical folate deficiency. In: LB Bailey, ed.Folate in Health and Disease. Second edition. Boca Raton, Florida: CRC Press, Taylor and Francis Group, 2010.

18. Siemans Canada. Immulite 2000 Folic Acid Insert. Mississauga, Ontario: Siemans Canada, Ltd., 2009.

19. Siemans Canada . Immulite 2000 Vitamin B12 Package Insert #P1L2KVB-22. Mississauga, Ontario: Siemans Canada, Ltd., 2006.

20. Refsum H, Smith AD, Ueland PM, et al. Facts and recommendations about total homocysteine determinations: An expert opinion. Clinical Chemistry 2004; 50(1): 3-32.

21. Refsum H, Yajnik CS, Gadkari M, et al. Hyperhomocysteinemia and elevated methylmalonic acid indicate a high prevalence of cobalamin deficiency in Asian Indians. American Journal of Clinical Nutrition 2001; 74(2): 233-41.

22. Ortho-Clinical Diagnostics. VITROS Chemistry Products Homocysteine Reagents - Instructions for Use. Publication number J23410_EN (version 1.0)L. Markham, Ontario: Ortho-Clinical Diagnostics Inc.; 2006.

23. Rust K, Rao J. Variance estimation for complex surveys using replication techniques. Statistical Methods in Medical Research 1996; 5: 281-310.

24. Statistics Canada. Canadian Health Measures Survey (CHMS) Data User Guide: Cycle 1. Available at: http://www.statcan.gc.ca/imdb-bmdi/document/5071_D2_T1_V1-eng.pdf.  Accessed May 5, 2011.

25. Shakur YA, Garriguet D, Corey P, et al. Folic acid fortification above mandated levels results in a low prevalence of folate inadequacy among Canadians. American Journal of Clinical Nutrition 2010; 92(4): 818-25.

26. Sherwood KL, Houghton LA, Tarasuk V, et al. One-third of pregnant and lactating women may not be meeting their folate requirements from diet alone based on mandated levels of folic acid fortification. Journal of Nutrition 2006; 136(11): 2820-6.

27. Shuaibi AM, House JD, Sevenhuysen GP. Folate status of young Canadian women after folic acid fortification of grain products. Journal of the American Dietetic Association 2008; 108(12): 2090-4.

28. McNulty B, Pentieva K, Marshall B, et al. Women's compliance with current folic acid recommendations and achievement of optimal vitamin status for preventing neural tube defects. Human Reproduction 2011; 26(6): 1530-6.

29. Health Canada. Prenatal Nutrition Guidelines for Health Professionals - Folate Contributes to a Healthy Pregnancy.  Available at: http://www.hc-sc.gc.ca/fn-an/pubs/nutrition/folate-eng.php. Accessed September 17, 2011.

30. Health Canada. Multi-vitamin/Mineral Supplement Monograph. Available at: http://www.hc-sc.gc.ca/dhp-mps/prodnatur/applications/licen-prod/monograph/multi_vitmin_suppl-eng.php#table8foot1.  Accessed October 14, 2011.