1. Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine,
2. Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, Pennsylvania;
3. Division of Pulmonary and Critical Care Medicine, Washington University in St. Louis, St. Louis, Missouri;
4. Division of Pulmonary, Critical Care, and Sleep Medicine, MetroHealth Medical Center, Cleveland, Ohio;
5. Electrical & Computer Engineering and Computer Science Department, University of New Haven, West Haven, Connecticut;
6. Department of Epidemiology, University of Florida, Gainesville, Florida;
7. Department of Surgery, and
8. Department of Pharmacology and Chemical Biology and
9. Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
10. Division of Endocrinology and Metabolism, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania;