1 Department of Neurological Surgery Thomas Jefferson University Hospital Philadelphia, Pennsylvania.
2 Department of Radiology Mayo Clinic Rochester, Minnesota.
3 Department of Neurosurgery Good Samaritan Hospital Medical Center West Islip, sNew York.
4 Department of Neurosurgery The Ohio State University Wexner Medical Center Columbus, Ohio.
5 Department of Neurosurgery Advocate Aurora Health Chicago, Illinois.
6 Department of Neuroscience Valley Baptist Medical Center/University of Texas Rio Grande Valley Harlingen, Texas.
7 Department of Neurosurgery University of Michigan Ann Arbor, Michigan.
8 Department of Neurosurgery Duke University Medical Center Durham, North Carolina.
9 Department of Neurosurgery and Toshiba Stroke Research Center School of Medicine and Biomedical Sciences University at Buffalo State University of New York Buffalo, New York.
10 Department of Neurosurgery University of Iowa Hospital and Clinics Iowa City, Iowa.
11 Department of Neurosurgery and Radiology Columbia University Medical Center New York, New York.
12 Department of Neurosurgery Mayo Clinic Scottsdale, Arizona.