1. Use of multivitamins, intake of B vitamins, and risk of ovulatory infertility 
Jorge E. Chavarro, M.D., Sc.D., Janet W. Rich-Edwards, Sc.D., M.P.H., Bernard A. Rosner, Ph.D., Walter C. Willett, M.D., Dr.P.H. 
Fertility and Sterility 
Volume 89, Issue 3, Pages (March 2008)
DOI: /j.fertnstert
Copyright © 2008 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Multivariate-adjusted (see Table 4, footnote c) relative risk of ovulatory infertility by total intake of folic acid among noncontracepting women (women who did not report recent use of hormonal contraception, barrier methods, intrauterine devices, or spermicides).
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2008 American Society for Reproductive Medicine Terms and Conditions