1. Department of Neurology, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
2. Translational Center of Excellence for Neuroepidemiology and Neurology Outcomes Research University of Pennsylvania Philadelphia Pennsylvania USA
3. Center for Clinical Epidemiology and Biostatistics University of Pennsylvania Philadelphia Pennsylvania USA
4. Department of Ophthalmology University of Pennsylvania Philadelphia Pennsylvania USA
5. Leonard Davis Institute of Health Economics University of Pennsylvania Philadelphia Pennsylvania USA
6. Department of Biostatistics Epidemiology, and Informatics University of Pennsylvania Philadelphia Pennsylvania USA