title: Counter-intuitive results from nonrandomized trials may unmask the "art of medicine".
authors.forename: George C
authors.initials: GC
authors.lastname: Robinson
mesh_terms: D000367:Age Factors; D000368:Aged; D006348:Cardiac Surgical Procedures / Q000379:methods* / Q000401:mortality; D002986:Clinical Trials as Topic; D006801:Humans; D020380:Needs Assessment; D011379:Prognosis; D018570:Risk Assessment; D016019:Survival Analysis; D065227:Transfusion Reaction