title: Randomised controlled trials: "within subject" versus "between subject" designs.
authors.affiliation: Institute for Medical and Biomedical Education, St George's, University of London, London, UK p.sedgwick@sgul.ac.uk.
authors.forename: Philip
authors.initials: P
authors.lastname: Sedgwick
mesh_terms: D035061:Control Groups; D018592:Cross-Over Studies; D004311:Double-Blind Method; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods*