title: Reply.
authors.affiliation: Kaiser Permanente, Northern California Region. Electronic address: nshorstein@eyeonsight.org.
authors.forename: Neal H
authors.initials: NH
authors.lastname: Shorstein
authors.affiliation: Kaiser Permanente, Northern California Region.
authors.forename: Liyan
authors.initials: L
authors.lastname: Liu
authors.affiliation: Kaiser Permanente, Northern California Region.
authors.forename: Michael D
authors.initials: MD
authors.lastname: Waxman
authors.affiliation: Kaiser Permanente, Northern California Region.
authors.forename: Lisa J
authors.initials: LJ
authors.lastname: Herrinton