1 Division of Pulmonary, Department of Medicine, Intermountain Medical Center, Murray, UT, and Division of Pulmonary and Critical Care, Department of Medicine, University of Utah School of Medicine, Salt Lake City, UT Division of Cardiovascular Medicine, Department of Medicine, Stanford University, Stanford, CA Department of Anesthesia, Beth Israel Deaconess Medical Center, Boston, MA Department of Anesthesia, Stanford University, Stanford, CA Division of Pulmonary, Department of Medicine, Intermountain Medical Center, Murray, UT, and Division of Pulmonary and Critical Care, Department of Medicine, University of Utah School of Medicine, Salt Lake City, UT Division of Pulmonary, Department of Medicine, Intermountain Medical Center, Murray, UT Department of Anesthesia, University of Chicago, Chicago, IL Division of Pulmonary, Department of Medicine, Intermountain Medical Center, Murray, UT, and Division of Pulmonary and Critical Care, Department of Medicine, University of Utah School of Medicine, Salt Lake City, UT.