1. Department of Medicine, Pulmonary Allergy and Critical Care Division, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania;
2. Department of Medicine, Pulmonary and Critical Care Division, Indiana University School of Medicine, Indianapolis, Indiana;
3. Department of Medicine University of Illinois at Chicago, Chicago, Illinois;
4. University of Texas Medical Branch (UTMB), Galveston, Texas;
5. Oak Ridge Associated Universities, NASA Postdoctoral Program, Moffett Field, California;
6. NASA Ames Research Center, Moffett Field, California;
7. Department of Pathology, Jefferson University Hospital, Philadelphia, Pennsylvania; and
8. Richard L. Roudebush VA Medical Center, Indianapolis, Indiana