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3. S Hernandez-Diaz , Folic acid antagonists during pregnancy and the risk of birth defects. New England Journal of Medicine 2000; 343: 1608–1614.
4. S Hernandez-Diaz , Neural tube defects in relation to use of folic acid antagonists during pregnancy. American Journal of Epidemiology 2001; 153: 961–968.
5. AE Czeizel , M Toth , M Rockenbauer . Population-based case control study of folic acid supplementation during pregnancy. Teratology 1996; 53: 345–351.
6. RJ Berry , Prevention of neural-tube defects with folic acid in China. New England Journal of Medicine 1999; 341: 1485–1490.
8. MM Werler , Multivitamin supplementation and risk of birth defects. American Journal of Epidemiology 1999; 150: 675–682.
9. QH Yang , Does periconceptional multivitamin use reduce the risk for limb deficiency in offspring? Epidemiology 1997; 8: 157–161.
10. AE Czeizel . Reduction of urinary tract and cardiovascular defects by periconceptional multivitamin supplementation. American Journal of Medical Genetics 1996; 62: 179–183.
12. YM Smulders , Trimethoprim and fasting plasma homocysteine. Lancet 1998; 352: 1827–1828.
14. DA Grimes , MD Creinin . Induced abortion: an overview for internists. Annals of Internal Medicine 2004; 140: 620–626.
20. E von Elm , The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) statement: guidelines for reporting observational studies. Lancet 2007; 370: 1453–1457.
21. HT Sorensen , Identification of patients treated with strong analgesics: an assessment of two Danish information systems with respect to epidemiological research. Journal of Medical Systems 1996; 20: 57–65.
22. S Kumar . Occupational, environmental and lifestyle factors associated with spontaneous abortion. Reproductive Sciences 2011; 18: 915–930.
24. L Buss , Spontaneous abortion: a prospective cohort study of younger women from the general population in Denmark. Validation, occurrence and risk determinants. Acta Obstetrica et Gynecologia Scandinavica 2006; 85: 467–475.
27. SZ Wiktor , Efficacy of trimethoprim-sulphamethoxazole prophylaxis to decrease morbidity and mortality in HIV-1-infected patients with tuberculosis in Abidjan, Cote d'Ivoire: a randomised controlled trial. Lancet 1999; 353: 1469–1475.
28. AJ Nunn , Role of co-trimoxazole prophylaxis in reducing mortality in HIV infected adults being treated for tuberculosis: randomised clinical trial. British Medical Journal 2008; 337: a257.
29. J Mermin , Effect of co-trimoxazole prophylaxis on morbidity, mortality, CD4-cell count, and viral load in HIV infection in rural Uganda. Lancet 2004; 364: 1428–1434.