1. Drexel University College of Medicine, Philadelphia, PA, USA
2. Department of Ophthalmology, Stanford University, Palo Alto, CA, USA
3. Department of Neurology and Neurological Sciences, Stanford University, Palo Alto, CA, USA
4. Divison of Ophthalmology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
5. Department of Ophthalmology, The Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
6. Department of Neurology, The Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA