title: Clinical study designs and corresponding levels of evidence: time to redefine?
authors.affiliation: Department of Surgery, Academic Medical Centre, Amsterdam, The Netherlands.
authors.forename: Christianne
authors.initials: C
authors.lastname: Buskens
mesh_terms: D019317:Evidence-Based Medicine; D006801:Humans; D064887:Observational Studies as Topic; D016032:Randomized Controlled Trials as Topic; D012107:Research Design