Affiliation: | a Department of Neurosurgery, University of Pennsylvania School of Medicine, 235 South Eighth Street, Philadelphia, PA 19106, United States b Department of Otorhinolaryngology and Head and Neck Surgery, University of Pennsylvania School of Medicine, Philadelphia, PA, United States c Department of Otorhinolaryngology and Head and Neck Surgery Ophthalmology, University of Pennsylvania School of Medicine, Philadelphia, PA, United States |