1. Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts;
2. Department of Neurosurgery, Baylor College of Medicine, Houston, Texas;
3. Department of Neurosurgery, Geisinger, Danville, Pennsylvania;
4. Philadelphia College of Osteopathic Medicine, Philadelphia, Pennsylvania
5. Research Institute of Neurointervention, Paracelsus Medical University, Salzburg, Austria; and