title: Bias and trials stopped early for benefit.
authors.forename: Susan S
authors.initials: SS
authors.lastname: Ellenberg
authors.forename: David L
authors.initials: DL
authors.lastname: DeMets
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Fleming
mesh_terms: D015982:Bias; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data*; D016896:Treatment Outcome