title: Ethical problems in the use of controls in medical research.
authors.affiliation: Department of Psychological Medicine, Wellington School of Medicine.
authors.forename: P
authors.initials: P
authors.lastname: Hay
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D035061:Control Groups; D028744:Ethics Committees, Research; D004992:Ethics, Medical; D033281:Nontherapeutic Human Experimentation; D018579:Patient Selection; D012107:Research Design; D035842:Research Subjects; D012189:Retrospective Studies; D018570:Risk Assessment