title: On opening "black boxes" and looking inside.
authors.forename: L I
authors.initials: LI
authors.lastname: Iezzoni
mesh_terms: D006302:Health Services Research / Q000379:methods; D006761:Hospitals / Q000592:standards; D006801:Humans; D017063:Outcome Assessment, Health Care / Q000592:standards*; D010414:Pennsylvania; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D014481:United States