1. University of Arkansas for Medical Sciences Little Rock Arkansas USA
2. Department of Otolaryngology – Head and Neck Surgery University of California Irvine California USA
3. Department of Otorhinolaryngology – Head and Neck Surgery University of Pennsylvania Philadelphia Pennsylvania USA
4. Department of Otolaryngology – Head and Neck Surgery University of Kentucky Lexington Kentucky USA
5. Department of Otolaryngology – Head and Neck Surgery The Pennsylvania State University Hershey Pennsylvania USA
6. Department of Otolaryngology – Head and Neck Surgery University of California, San Francisco San Francisco California USA
7. Department of Otolaryngology – Head and Neck Surgery University of California, Davis Davis California USA
8. Department of Otolaryngology – Head and Neck Surgery Southern Illinois University School of Medicine Springfield Illinois USA