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2. Centers for Disease Control and Prevention National Public Health Action Plan for the Detection, Prevention, and Management of Infertility, Atlanta, Georgia: Centers for Disease Control and Prevention 2014 https://www.cdc.gov/reproductivehealth/infertility/pdf/drh_nap_final_508.pdf
3. Prevalence of infertility in the United States as estimated by the current duration approach and a traditional constructed approach;Thoma;Fertility and Sterility,2013
4. Jamieson DJ Boulet SL Chang J Crawford S Kissin DM Kulkarni AD et al 2013 Assisted Reproductive Technology Fertility Clinic Success Rates Report ftp://ftp.cdc.gov/pub/Publications/art/ART-2013-Clinic-Report-Full.pdf
5. The relative contribution of assisted reproductive technologies and ovulation induction to multiple births in the United States 5 years after the Society for Assisted Reproductive Technology/American Society for Reproductive Medicine recommendation to limit the number of embryos transferred;Dickey;Fertility and Sterility,2007