1. Division of Stroke, Department of Neurology, Columbia University Medical Center, New York, NY, USA
2. Department of Emergency Medicine, Columbia University Medical Center, New York, NY, USA
3. Department of Biostatistics, Mailman School of Public Health, New York, NY, USA
4. Department of Epidemiology, Mailman School of Public Health, New York, NY, USA
5. Department of Socio-medical Sciences, Mailman School of Public Health, New York, NY, USA