title: Rebuttal From Drs Gaffney, Verhoef, and Hall.
authors.affiliation: Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, MA.
authors.forename: Adam W
authors.initials: AW
authors.lastname: Gaffney
authors.affiliation: Section of Pulmonary and Critical Care Medicine, University of Chicago, Chicago, IL. Electronic address: philip.verhoef@uchospitals.edu.
authors.forename: Philip A
authors.initials: PA
authors.lastname: Verhoef
authors.affiliation: Section of Pulmonary and Critical Care Medicine, University of Chicago, Chicago, IL.
authors.forename: Jesse B
authors.initials: JB
authors.lastname: Hall