title: The reply.
authors.affiliation: Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Md.
authors.forename: Roy C
authors.initials: RC
authors.lastname: Ziegelstein
authors.affiliation: Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Md.
authors.forename: David B
authors.initials: DB
authors.lastname: Hellmann
mesh_terms: D034201:Computers, Handheld; D004059:Diffusion of Innovation; D019317:Evidence-Based Medicine; D006801:Humans; D014463:Ultrasonography / Q000295:instrumentation*