title: Critical appraisal. 5. Randomised controlled trials: questions for valid evidence.
authors.affiliation: Department of Health Studies, University of York.
authors.forename: E A
authors.initials: EA
authors.lastname: Nelson
mesh_terms: D019317:Evidence-Based Medicine; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods / Q000592:standards*; D015203:Reproducibility of Results; D012107:Research Design / Q000592:standards*