“…We focused on the effects of such treatments on the opioid dependent women and their children. Methods In June 2007, we searched systematically for relevant literature in international scientific databases, selected studies according to pre-set criteria, appraised the methodological quality using checklists, and summarised the results in tables and in meta-analyses. …”

“…Method We systematically searched for studies of experimental and observational design in the following databases: Cochrane Library, MIDIRS, Cinahl, Embase, Medline and Swemed, June 2004. The search was updated in February 2005. …”