1 Department of Neurology (AGH), Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Translational Center of Excellence for Neuroepidemiology and Neurology Outcomes Research (AGH), University of Pennsylvania, Philadephia, Pennsylvania; Center for Clinical Epidemiology and Biostatistics (AGH), University of Pennsylvania, Philadelphia, Pennsylvania; Department of Ophthalmology (SLP), University of California, Los Angeles, California; Department of Ophthalmology (HEM), Stanford University, Palo Alto, California; Department of Neurology and Neurological Sciences (HEM), Stanford University, Palo Alto, California.