title: Removing bias in surgical trials.
authors.forename: A G
authors.initials: AG
authors.lastname: Johnson
authors.forename: J M
authors.initials: JM
authors.lastname: Dixon
mesh_terms: D006801:Humans; D017063:Outcome Assessment, Health Care; D016032:Randomized Controlled Trials as Topic; D015983:Selection Bias; D013514:Surgical Procedures, Operative