1. Department of Otorhinolaryngology—Head & Neck Surgery University of Pennsylvania Health System Philadelphia Pennsylvania USA
2. Department of Otolaryngology University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
3. Department of Otolaryngology—Head & Neck Surgery University of Miami Miller School of Medicine Miami Florida USA
4. Department of Otolaryngology—Head & Neck Surgery Thomas Jefferson University Health System Philadelphia Pennsylvania USA
5. Head and Neck Institute Cleveland Clinic Cleveland Ohio USA
6. Department of Otolaryngology University of Alabama at Birmingham Birmingham Alabama USA
7. Departments of Otolaryngology—Head & Neck Surgery and Neurological Surgery University of California Irvine California USA