title: Re: "using data sources beyond PubMed has a modest impact on the results of systematic reviews of therapeutic interventions".
authors.affiliation: Walaeus Library, Leiden University Medical Center, C1-Q, PO Box 9600, 2300 RC Leiden, The Netherlands. Electronic address: j.w.schoones@lumc.nl.
authors.forename: Jan W
authors.initials: JW
authors.lastname: Schoones
authors.affiliation: Medical Library, MCH Westeinde, PO Box 432, 2501 CK The Hague, The Netherlands.
authors.forename: Thomas
authors.initials: T
authors.lastname: Vissers
mesh_terms: D016247:Information Storage and Retrieval; D039781:PubMed