1. Head and Neck Service, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York.
2. Department of Otolaryngology, Icahn School of Medicine at Mount Sinai, New York, New York.
3. Section of Biostatistics and Epidemiology, Geisel School of Medicine at Dartmouth, Dartmouth University, Hanover, New Hampshire.
4. The VA Outcomes Group, White River Junction Veterans' Affairs Medical Center, White River Junction, Vermont.
5. The Dartmouth Institute for Health Policy and Clinical Practice; Dartmouth University, Hanover, New Hampshire.