1. Department of Neurology and Stroke Center, UCLA, Los Angeles, California, USA
2. Department of Radiology and Stroke Center, UCLA, Los Angeles, California, USA
3. Department of Neurosurgery, Millard Fillmore Hospital, Buffalo, New York, USA
4. Department of Neurology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
5. Department of Radiology, Erlanger Hospital, Chatanooga, Tennessee, USA
6. Department of Neurology, Emory University, Atlanta, Georgia, USA
7. Department of Neurology, Oregon Health Science University, Portland, Oregon, USA
8. Department of Radiology, Riverside Methodist Hospital, Columbus, Ohio, USA
9. Department of Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA