title: In reply.
authors.affiliation: The Children's Hospital of Philadelphia, Center for Outcomes Research, Philadelphia, Pennsylvania (J.H.S.). silber@email.chop.edu.
authors.forename: Jeffrey H
authors.initials: JH
authors.lastname: Silber
authors.forename: Paul R
authors.initials: PR
authors.lastname: Rosenbaum
authors.forename: Lee A
authors.initials: LA
authors.lastname: Fleisher
mesh_terms: D005006:Ethnicity / Q000706:statistics & numerical data*; D054625:Healthcare Disparities / Q000706:statistics & numerical data*; D006801:Humans; D009765:Obesity / Q000150:complications* / Q000453:epidemiology*; D013514:Surgical Procedures, Operative / Q000706:statistics & numerical data*