1 Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA; Department of Medicine Statistics Core, David Geffen School of Medicine at UCLA, Los Angeles, CA; Jonsson Comprehensive Cancer Center, David Geffen School of Medicine at UCLA, Los Angeles, CA; UCLA Head and Neck Cancer Program, David Geffen School of Medicine at UCLA, Los Angeles, CA.
2 Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA; Department of Medicine Statistics Core, David Geffen School of Medicine at UCLA, Los Angeles, CA; Jonsson Comprehensive Cancer Center, David Geffen School of Medicine at UCLA, Los Angeles, CA; UCLA Head and Neck Cancer Program, David Geffen School of Medicine at UCLA, Los Angeles, CA. Electronic address: mstjohn@mednet.ucla.edu.