title: Clinician-trialist rounds: 5. Cointervention bias--how to diagnose it in their trial and prevent it in yours.
authors.affiliation: Trout Research & Education Centre at Irish Lake, RR 1, Markdale, Ontario, Canada N0C 1H0. sackett@bmts.com
authors.forename: David L
authors.initials: DL
authors.lastname: Sackett
mesh_terms: D015982:Bias; D018849:Controlled Clinical Trials as Topic / Q000379:methods / Q000706:statistics & numerical data*; D003627:Data Interpretation, Statistical; D006801:Humans; D012306:Risk