1. Division of Pulmonary and Critical Care Medicine and
2. Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York;
3. Departments of Anesthesiology and Physiology and Cellular Biophysics, College of Physicians and Surgeons, Columbia University Medical Center, New York, New York; and
4. Department of Molecular Microbiology and Immunology, Brown University, Providence, Rhode Island