1. Department of Ophthalmology, VA Portland Health Care System, Portland, OR, USA/Department of Neurology, Oregon Health & Science University, Portland, OR, USA/Casey Eye Institute, Oregon Health & Science University, Portland, OR, USA
2. Department of Neurology, Oregon Health & Science University, Portland, OR, USA
3. Department of Neurology, VA Portland Health Care System, Portland, OR, USA/Department of Neurology, Oregon Health & Science University, Portland, OR, USA