1. Department of Otolaryngology–Head and Neck SurgeryUniversity of California, Irvine Medical Center Orange
2. Department of Head and Neck SurgeryDavid Geffen School of Medicine at the University of California, Los Angeles (UCLA) Medical CenterLos Angeles California
3. Department of Otorhinolaryngology–Head and Neck SurgeryHospital of the University of PennsylvaniaPhiladelphia PennsylvaniaU.S.A.
4. Jonsson Comprehensive Cancer CenterLos Angeles California
5. Head and Neck Cancer ProgramUCLA Medical CenterLos Angeles California
6. Department of Otolaryngology–Head and Neck SurgeryRush University Medical CenterChicago Illinois U.S.A.