title: Response.
authors.affiliation: Advanced Lung Disease and Transplant Program, Department of Medicine, Inova Fairfax Hospital, Falls Church, VA. Electronic address: steven.nathan@inova.org.
authors.forename: Steven D
authors.initials: SD
authors.lastname: Nathan
authors.affiliation: Advanced Lung Disease and Transplant Program, Department of Medicine, Inova Fairfax Hospital, Falls Church, VA.
authors.forename: A Whitney
authors.initials: AW
authors.lastname: Brown
authors.affiliation: Advanced Lung Disease and Transplant Program, Department of Medicine, Inova Fairfax Hospital, Falls Church, VA.
authors.forename: Nargues A
authors.initials: NA
authors.lastname: Weir
mesh_terms: D005080:Exercise Test / Q000379:methods*; D017079:Exercise Tolerance / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010807:Physical Endurance / Q000502:physiology*; D016138:Walking / Q000502:physiology*