1 Division of Pulmonary and Critical Care Medicine, Intermountain Medical Center; and the Division of Respiratory, Critical Care and Occupational Pulmonary Medicine, University of Utah, Murray, UT. Electronic address: michael.lanspa@imail.org.
2 Division of Pulmonary and Critical Care Medicine, Intermountain Medical Center; and the Division of Respiratory, Critical Care and Occupational Pulmonary Medicine, University of Utah, Murray, UT.