title: Quantifying the unquantifiable.
authors.affiliation: Department of Evidence-based Medicine and Clinical Epidemiology, Danube University, Karl Dorrek-Straße, Krems, Austria. gerald.gartlehner@donau-uni.ac.at
authors.forename: Gerald
authors.initials: G
authors.lastname: Gartlehner
mesh_terms: D002986:Clinical Trials as Topic; D012196:Review Literature as Topic