1. Department of Neurosurgery, University of Florida College of Medicine, Gainesville, Florida
2. Department of Neurosurgery, University of Texas-Southwestern, Dallas, Texas
3. Department of Neurological Surgery, Mayo Clinic, Rochester, Minnesota
4. Division of Neurosurgery, Albany Medical Center Hospital, Albany, New York
5. Interventional Neuroradiology, Department of Radiology, West Virginia University School of Medicine, Morgantown, West Virginia
6. Department of Neurosurgery, Capital Institute for Neurosciences, Trenton, New Jersey
7. Mayfield Clinic, Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio
8. Department of Neurosurgery, University of Puerto Rico, San Juan, Puerto Rico
9. Departments of Neurosurgery and Radiology, Toshiba Stroke Research Center, School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York at Buffalo
10. Department of Neurosurgery, Vanderbilt University, Nashville, Tennessee