1. Department of Neurosurgery, Warren Alpert Medical School of Brown University, Providence Rhode Island, USA.
2. Department of Diagnostic Imaging, and Warren Alpert Medical School of Brown University, Providence Rhode Island, USA.
3. Department of Emergency Medicine, Warren Alpert Medical School of Brown University, Providence Rhode Island, USA.
4. Department of Emergency Medicine, University of Florida College of Medicine, Gainesville Florida, USA.
5. Department of Health Sciences, Medical University of South Carolina, Charleston South Carolina, USA.
6. Department of Radiology and Emory University School of Medicine, Atlanta Georgia, USA.
7. Department of Emergency Medicine, Emory University School of Medicine, Atlanta Georgia, USA.