1. University of Washington and Seattle Children's Research Institute; Seattle Washington
2. Boston Children's Hospital; Harvard Medical School; Boston Massachusetts
3. University Otolaryngology; Providence Rhode Island
4. Baylor College of Medicine; Houston Texas
5. Children's Hospital of Philadelphia; University of Pennsylvania; Philadelphia Pennsylvania
6. University of California, San Francisco; San Francisco California
7. Clinical Research Associates; New York New York
8. Mailman School of Public Health; Columbia University; New York New York
9. Columbia University Medical Center; New York New York