1 1Department of Neurosurgery, Medical University of Vienna, Vienna Health Care Group, University Hospital Vienna, Austria.
2 2Department of Neurosurgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania.
3 3Department of Neurosurgery, University of Tennessee Health Science Center, Memphis, Tennessee.
4 4Departments of Neurosurgery and Otolaryngology, University of Colorado School of Medicine and Hospital, Aurora, Colorado.
5 5Division of Facial Plastic Surgery, Departments of Otolaryngology and Neurological Surgery, University of Washington School of Medicine, Seattle, Washington; and.
6 6Department of Neurosurgery, Otolaryngology and Clinical Anatomy, Mayo Clinic, Rochester, Minnesota.