Affiliation: | 1. Department of Neurosurgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, U.S.A.;2. A.B.K., C.H.S., and R.C. are paid consultants for Karl Storz and Stryker Corporations. D.M.P. is a paid consultant for Stryker Corporation.;3. Department of Otolaryngology–Head and Neck Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, U.S.A.;4. Department of Otolaryngology, Universidade Federal do Parana, Curitiba, Paraná, Brazil;5. Department of Otolaryngology, University of North Carolina, Chapel Hill, North Carolina, U.S.A. |