title: A common question revisited: can differences in clinical severity explain the volume-outcome relationship?
authors.forename: Ryan P
authors.initials: RP
authors.lastname: Merkow
authors.forename: Karl Y
authors.initials: KY
authors.lastname: Bilimoria
mesh_terms: D017052:Hospital Mortality; D006761:Hospitals / Q000592:standards / Q000706:statistics & numerical data*; D006801:Humans; D009369:Neoplasms / Q000401:mortality* / Q000601:surgery*; D017063:Outcome Assessment, Health Care; D012307:Risk Factors; D012720:Severity of Illness Index