1 Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California.
2 Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, Cedars-Sinai Medical Center, Los Angeles, California.
3 The VA Outcomes Group, Department of Veterans Affairs, White River Junction, Vermont.
4 Geisel School of Medicine at Dartmouth Department of Surgery-Otolaryngology Head and Neck Surgery, Dartmouth Institute for Health Policy and Clinical Practice, Hanover, New Hampshire.
5 Section of Endocrine Surgery, UCLA David Geffen School of Medicine, Los Angeles, California.