1 Geriatrics Research Education and Care Center, Durham VA Medical Center, Durham, NC, USA; Division of Pulmonary and Critical Care, Duke University Medical Center, Durham, NC, USA. Electronic address: [email protected].
2 Allegheny Health Network, Pittsburgh, PA, USA.
3 Marsico Lung Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Division of Pulmonary and Critical Care Medicine, University of Michigan, Ann Arbor, MI, USA.
4 Division of Pulmonary and Critical Care, Duke University Medical Center, Durham, NC, USA; Division of Pulmonary, Durham VA Medical Center, Durham, NC, USA.
5 Veterans Affairs Center for Innovation in Quality, Effectiveness, and Safety, Michael E. DeBakey Veterans Affairs Medical Center, Houston, TX, USA; Baylor College of Medicine, Houston, TX, USA; University of California San Francisco, San Francisco, CA, USA.