title: Classification systems to improve assessment of risk of bias.
authors.affiliation: Centre d’Epidemiologie Clinique, French Cochrane Centre, 1 place du Parvis Notre Dame, Paris Cedex 4, France. isabelle.boutron@htd.aphp.fr Boutron).
authors.forename: Isabelle
authors.initials: I
authors.lastname: Boutron
authors.forename: Philippe
authors.initials: P
authors.lastname: Ravaud
mesh_terms: D015340:Epidemiologic Research Design; D017408:Guidelines as Topic; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods* / Q000592:standards*