1. Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, and
2. Dorothy P. and Richard P. Simmons Center for Interstitial Lung Disease, University of Pittsburgh, Pittsburgh, Pennsylvania;
3. Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, State University of New York at Buffalo Jacobs Schools of Medicine and Biomedical Sciences, Buffalo, New York;
4. College of Nursing and
5. Division of Pulmonary and Critical Care, Medical University of South Carolina, Charleston, South Carolina; and
6. Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, Pennsylvania