Affiliation: | 2. Department of Neurology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania;3. Department of Neurology Translational Center of Excellence for Neuroepidemiology and Outcomes Research, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania;4. Department of Neuroradiology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania;5. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania |