title: Burden of proof.
authors.forename: Max Harry
authors.initials: MH
authors.lastname: Weil
mesh_terms: D001803:Blood Transfusion / Q000592:standards* / Q000706:statistics & numerical data; D002986:Clinical Trials as Topic; D003422:Critical Care / Q000592:standards; D019317:Evidence-Based Medicine / Q000458:organization & administration*; D006801:Humans; D016134:Organizational Policy; D010818:Practice Patterns, Physicians' / Q000592:standards*; D013997:Time Factors; D065227:Transfusion Reaction