1. Department of Otolaryngology–Head and Neck SurgerySchool of MedicineUniversity of California–San FranciscoSan FranciscoCaliforniaUSA
2. Department of Head and Neck SurgeryKaiser PermanenteOaklandCaliforniaUSA
3. Surgery ServiceDepartment of Veterans Affairs Medical CenterSan FranciscoCaliforniaUSA