1. Department of Otolaryngology–Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
2. Department of Oncology–Biostatistics, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
3. Milton J. Dance Head and Neck Center, Greater Baltimore Medical Center, Baltimore, Maryland, USA
4. Division of Otolaryngology–Head and Neck Surgery, Department of Surgery, University of California, San Diego, La Jolla, California, USA