title: Response.
authors.affiliation: Department of Medicine, Section of Pulmonary and Critical Care, University of Chicago, Chicago, IL.
authors.forename: Krysta S
authors.initials: KS
authors.lastname: Wolfe
authors.affiliation: Department of Medicine, Section of Pulmonary and Critical Care, University of Chicago, Chicago, IL. Electronic address: jkress@medicine.bsd.uchicago.edu.
authors.forename: John P
authors.initials: JP
authors.lastname: Kress