1. Division of Allergy, Pulmonary, and Critical Care Medicine, Department of Medicine, and
2. Division of Allergy, Pulmonary, and Critical Care Medicine, University of Alabama at Birmingham Medical Center, Birmingham, Alabama; and
3. Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
4. Department of Biochemistry, Vanderbilt University, Nashville, Tennessee