1. Departments of Neurosurgery and Radiology, School of Medicine and Biomedical Sciences, and Toshiba Stroke and Vascular Research Center, University at Buffalo, State University of New York, USA
2. Department of Neurosurgery, Rush University Medical Center, Chicago, USA
3. Capital Health, Trenton, USA
4. University of Tennessee Department of Neurosurgery/Semmes-Murphey Neurologic and Spine Institute, Memphis, USA