Affiliation: | 1. Department of Otolaryngology, University of Pittsburgh Medical Center, , Pittsburgh, Pennsylvania, U.S.A.;2. Department of Otolaryngology/Head and Neck surgery, LSUHSC Shreveport, , Shreveport, Louisiana, U.S.A.;3. University of Pittsburgh Cancer Institute, Biostatistics Facility, , Pittsburgh, Pennsylvania, U.S.A. |