title: Avoiding immortal time bias in the American College of Surgeons National Surgical Quality Improvement Program readmission measure.
authors.affiliation: Department of Surgery, Walter Reed National Military Medical Center, Bethesda, Maryland.
authors.forename: Donald J
authors.initials: DJ
authors.lastname: Lucas
authors.affiliation: Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland.
authors.forename: Elliott R
authors.initials: ER
authors.lastname: Haut
authors.affiliation: Department of Surgery, Georgetown University Hospital, Washington, DC.
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Hechenbleikner
authors.affiliation: Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland.
authors.forename: Elizabeth C
authors.initials: EC
authors.lastname: Wick
authors.affiliation: Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland.
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Pawlik
mesh_terms: D015982:Bias; D006801:Humans; D007902:Length of Stay; D010359:Patient Readmission; D058996:Quality Improvement; D013997:Time Factors; D014481:United States