title: OPCAB selection bias.
authors.forename: M A
authors.initials: MA
authors.lastname: Wait
mesh_terms: D015982:Bias; D002315:Cardiopulmonary Bypass; D001026:Coronary Artery Bypass; D006801:Humans; D010043:Outcome and Process Assessment, Health Care / Q000706:statistics & numerical data; D018579:Patient Selection; D018570:Risk Assessment