1. Department of Otolaryngology-Head and Neck Surgery, Boston Medical Center, Boston, Massachusetts, USA.
2. Department of Biostatistics, Boston University School of Public Health, Boston, Massachusetts, USA.
3. Otolaryngology Associates, P.C., Fairfax, Virginia, USA.
4. Boston University School of Medicine, Boston, Massachusetts, USA.
5. The Spiegel Center, Newton, Massachusetts, USA.