1. Duke University Medical Center, Durham, North Carolina;
2. University of California Medical Center, San Diego, California;
3. Massachusetts General Hospital, Boston, Massachusetts;
4. University of Cincinnati School of Medicine, Cincinnati, Ohio;
5. Pennsylvania State University Medical School, Hershey, Pennsylvania;
6. Mount Sinai Icahn School of Medicine, New York, New York;
7. Winthrop University Hospital, Mineola, New York;
8. Institute for Asthma and Allergy, Chevy Chase, Maryland; and
9. University of Texas Southwestern Medical School, Dallas, Texas