Thereareseveraldatabasesincluded:TheCochraneDatabaseofSystematicR includesthefulltextofregularlyup‐tedsystematicreviewsoftheeffects‐laboration.TheCochraneControlledTrialsRegis(CCTR)isabibliographicdatabaseofcon‐trolledtrialswhichincludesrefere, EM‐BASEetc ......