1. Department of Head and Neck SurgeryDavid Geffen School of Medicine at University of California Los AngelesLos AngelesCaliforniaUSA
2. Greater Los Angeles Veterans Administration Healthcare SystemLos AngelesCaliforniaUSA
3. Department of MedicineDavid Geffen School of Medicine at University of California Los AngelesLos AngelesCaliforniaUSA
4. Department of SurgeryDavid Geffen School of Medicine at University of California Los AngelesLos AngelesCaliforniaUSA