Affiliation: | 1. Department of Otolaryngology–Head and Neck Surgery, University of North Carolina Hospitals, Chapel Hill, North Carolina, U.S.A.;2. Department of Radiology, University of North Carolina Hospitals, Chapel Hill, North Carolina, U.S.A.;3. Department of Otolaryngology–Head and Neck Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A.;4. Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A.;5. Division of Neurosurgery, University of North Carolina Hospitals, Chapel Hill, North Carolina, U.S.A. |