title: What is Zelen's design?
authors.affiliation: National Primary Care Research and Development Centre, University of York.
authors.forename: D J
authors.initials: DJ
authors.lastname: Torgerson
authors.forename: M
authors.initials: M
authors.lastname: Roland
mesh_terms: D004992:Ethics, Medical; D006801:Humans; D007258:Informed Consent; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D012107:Research Design