title: Rebuttal from Dr Halpern.
authors.affiliation: From the Departments of Medicine (Division of Pulmonary and Critical Care Medicine), Biostatistics and Epidemiology, and Medical Ethics and Health Policy, Leonard Davis Institute Center for Health Incentives and Behavioral Economics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA. Electronic address: shalpern@exchange.upenn.edu.
authors.forename: Scott D
authors.initials: SD
authors.lastname: Halpern
mesh_terms: D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis*; D008403:Mass Screening / Q000379:methods*; D008962:Models, Theoretical; D017410:Practice Guidelines as Topic; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data*