Product Search Search Effective Health Care website Submit search Search Tip: Use double quotes around phrases to rank exact matches higher in the result list. 4 results Smoking Cessation Interventions in Pregnancy and Postpartum Care Systematic Review Archived February 25, 2014 Progestogens for Prevention of Preterm Birth Systematic Review Archived September 7, 2012 Nitrous Oxide for the Management of Labor Pain Systematic Review Archived August 23, 2012 Adjuvant Treatment for Phenylketonuria (PKU) Systematic Review Archived February 22, 2012