1. Pulmonary, Allergy, and Critical Care Medicine, University of Alabama, Birmingham, Alabama
2. Department of Biostatistical Sciences
3. Pulmonary, Critical Care, Allergy, and Immunologic Disease
4. Wake Forest Critical Illness Injury and Recovery Research Center, and
5. Department of Health and Exercise Science, Wake Forest University, Winston-Salem, North Carolina; and
6. Division of Pulmonary, Critical Care, and Sleep Medicine, University of Kentucky, Lexington, Kentucky