title: When to stop a clinical trial.
authors.affiliation: Medical Statistics Unit, London School of Hygiene and Tropical Medicine.
authors.forename: S J
authors.initials: SJ
authors.lastname: Pocock
mesh_terms: D002986:Clinical Trials as Topic / Q000592:standards*; D003627:Data Interpretation, Statistical; D003657:Decision Making; D035081:Editorial Policies; D004992:Ethics, Medical; D033181:Information Dissemination; D018570:Risk Assessment; D036302:Therapeutic Human Experimentation; D035501:Uncertainty