1. Cleveland Clinic Foundation Head and Neck Institute, Cleveland, Ohio, USA
2. Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, USA
3. New York Eye and Ear Infirmary of Mount Sinai, New York, New York, USA
4. Henry Ford Health System, Detroit, Michigan, USA
5. Northwestern University, Chicago, Illinois, USA
6. Stanford University, Palo Alto, California, USA
7. University of Cincinnati, Cincinnati, Ohio, USA
8. Seattle Children’s Hospital, Seattle, Washington, USA
9. Massachusetts Eye and Ear, Boston, Massachusetts, USA