1. Eastern Virginia Medical School, Norfolk, Virginia, USA
2. University of Mississippi Medical Center, Jackson, Mississippi, USA
3. SUNY Downstate Medical Center, Brooklyn, New York, USA
4. University of Kentucky, Lexington, Kentucky, USA
5. Anderson ENT & Facial Plastics, Anderson, South Carolina, USA
6. University of Connecticut, Farmington, Connecticut, USA
7. Manhattan Eye, Ear and Throat Hospital and New York Head and Neck Institute, New York, New York, USA
8. Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA
9. Louisiana State University, Shreveport, Louisiana, USA
10. Beachwood Family Health Center, Beachwood, Ohio, USA
11. University of Cincinnati, Cincinnati, Ohio, USA
12. New York University School of Medicine, Great Neck, New York, USA
13. University of California Davis Medical Center, Sacramento, California, USA
14. University of Utah, Salt Lake City, Utah, USA
15. Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
16. Emory University, Atlanta, Georgia, USA
17. American Academy of Otolaryngology—Head and Neck Surgery Foundation, Alexandria, Virginia, USA