1. Moran Eye Center, Department of Ophthalmology and Visual Sciences, The University of Utah, Salt Lake City, Utah, USA
2. Ruiz Department of Ophthalmology and Visual Science, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas, USA
3. Robert Cizik Eye Clinic, Houston, Texas, USA
4. Department of Neurology, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas, USA
5. Department of Radiology, The University of Utah, Salt Lake City, Utah, USA
6. Department of Neurology, The University of Utah, Salt Lake City, Utah, USA
7. Division of Epidemiology, The University of Utah, Salt Lake City, Utah, USA