title: Users' guides to the medical literature. II. How to use an article about therapy or prevention. A. Are the results of the study valid? Evidence-Based Medicine Working Group.
authors.affiliation: Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
authors.forename: G H
authors.initials: GH
authors.lastname: Guyatt
authors.forename: D L
authors.initials: DL
authors.lastname: Sackett
authors.forename: D J
authors.initials: DJ
authors.lastname: Cook
mesh_terms: D002986:Clinical Trials as Topic; D016240:Grateful Med; D008523:MEDLARS; D010506:Periodicals as Topic; D015203:Reproducibility of Results; D012107:Research Design