title: Reply.
authors.affiliation: Division of Allergy and Clinical Immunology, Johns Hopkins University, Baltimore, Md. Electronic address: jodytversky@jhmi.edu.
authors.forename: Jody R
authors.initials: JR
authors.lastname: Tversky
authors.affiliation: Division of Allergy and Clinical Immunology, Johns Hopkins University, Baltimore, Md.
authors.forename: Robert G
authors.initials: RG
authors.lastname: Hamilton