1. Department of Otolaryngology Head and Neck Surgery, University of California San Francisco, San Francisco, California, USA.
2. Emory University School of Medicine, Atlanta, Georgia, USA.
3. UC San Francisco School of Medicine, San Francisco, California, USA.
4. Department of Otolaryngology Head and Neck Surgery, Virginia Tech University, Blacksburg, Virginia, USA.
5. Carilion Clinic, Roanoake, Virginia.