1. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Intermountain Medical Center, Murray, Utah
2. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City
3. University of Utah School of Medicine, Salt Lake City
4. Department of Physical Medicine and Rehabilitation, University of North Carolina School of Medicine, Chapel Hill
5. Department of Medicine, University of Wisconsin School of Medicine, Madison
6. Statistical Data Center, Intermountain Healthcare, Murray, Utah
7. Divisions of Epidemiology and Infectious Disease, Department of Medicine, University of Utah School of Medicine, Salt Lake City
8. Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Oregon Health and Sciences University, Portland
9. Department of Emergency Medicine, Intermountain Medical Center, Murray, Utah
10. Department of Emergency Medicine, Stanford University, Palo Alto, California