1. The VA Outcomes Group, Department of Veterans Affairs Medical Center, White River Junction, Vermont
2. Section of Otolaryngology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire
3. The Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, New Hampshire
4. Head and Neck Service, Memorial Sloan Kettering Cancer Center, New York, New York
5. Department of Surgery, Kuma Hospital, Kobe, Japan