1. Comprehensive Stroke Center, Department of Neurology, Tulane University, New Orleans, LA, USA
2. Department of Neurology, Columbia University, New York, NY, USA
3. Departments of Neurosurgery and Neurology, University of Texas Medical School at Houston, USA
4. Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, AL, USA
5. Department of Biostatistics, School of Public Health, University of Alabama at Birmingham, Birmingham, AL, USA