1. Division of Pulmonary, Allergy, Critical Care, Occupational and Sleep Medicine; Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana;
2. Department of Anesthesiology, Indiana University School of Medicine, Indianapolis, Indiana;
3. Department of Physical Therapy, Indiana University School of Health and Rehabilitation Sciences;
4. Center for Immunobiology, Indiana University School of Medicine, Indianapolis, Indiana; and
5. Richard L. Roudebush VA Medical Center, Indianapolis, Indiana