title: Understanding controlled trials. Randomisation methods: concealment.
authors.affiliation: National Primary Care Research and Development Centre, Centre for Health Economics, University of York, York YO1 5DD.
authors.forename: D J
authors.initials: DJ
authors.lastname: Torgerson
authors.forename: C
authors.initials: C
authors.lastname: Roberts
mesh_terms: D018849:Controlled Clinical Trials as Topic; D011897:Random Allocation