1. Department of General Surgery, Division of Otolaryngology–Head and Neck SurgeryPenn State University Hershey Medical Center Hershey Pennsylvania
2. Department of Otolaryngology–Head and Neck SurgeryThomas Jefferson University Hospitals Philadelphia PA U.S.A
3. Department of Otolaryngology–Head and Neck SurgeryUniversity of California San Diego San Diego CA U.S.A.