title: Response.
authors.affiliation: Division of Pulmonary and Critical Care Medicine, Pulmonary Center, Boston University School of Medicine, Boston, MA. Electronic address: alwalkey@bu.edu.
authors.forename: Allan J
authors.initials: AJ
authors.lastname: Walkey
authors.affiliation: Data Coordinating Center, Boston University School of Public Health, Boston, MA.
authors.forename: Michael R
authors.initials: MR
authors.lastname: Winter
authors.affiliation: Sections of Cardiovascular Medicine and Preventive Medicine, Boston University School of Medicine, Boston, MA; Department of Epidemiology, Boston University School of Public Health, Boston, MA.
authors.forename: Emelia J
authors.initials: EJ
authors.lastname: Benjamin