Nous avons effectué des recherches bibliographiques dans Medline et la Cochrane Library (Cochrane Database of Systematic Reviews (CDSR), Database of Abstracts of Reviews of Effectiveness (DARE) et Cochrane Controlled Trial Register (CCTR)).
We gingen zoeken in de literatuur in Medline en The Cochrane Library (Cochrane Database of Systematic Reviews, Database of Abstracts of Reviews of Effectiveness en Cochrane Controlled Trial Register).