1. Department of Emergency Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
2. Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
3. Department of Neurology, University of Pittsburgh, Pittsburgh, Pennsylvania
4. Department of Neurology, Massachusetts General Hospital, Boston
5. Department of Neurology, University of Wisconsin, Madison
6. Department of Neurology, Pittsburgh VA Medical Center, Pittsburgh, Pennsylvania
7. Department of Emergency Medicine, University of Alabama at Birmingham School of Medicine