1. Dean McGee Eye Institute, Oklahoma City, Oklahoma;
2. University of Medicine and Health Sciences, Basseterre, Saint Kitts and Nevis, New York, New York;
3. Department of Ophthalmology, University of California San Francisco,California, San Francisco, California;
4. Baylor College of Medicine Department of Ophthalmology, Houston, Texas; and
5. Department of Biostatistics and Epidemiology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma.