1. VA St. Louis Healthcare System St. Louis, Missouri, United States 2Washington University School of Medicine, St. Louis, Missouri, United States
2. Michael E. DeBakey VA Medical Center, Houston, Texas, United States 4Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, United States
3. VA Tennessee Valley Healthcare System, Nashville, Tennessee, United States 6Vanderbilt Eye Institute, Vanderbilt University Medical, Nashville, Tennessee, United States
4. Boston University School of Medicine, Boston, Massachusetts, United States 8VA Boston Healthcare System, Boston, Massachusetts, United States 9Harvard University Medical School, Boston, Massachusetts, United States
5. DoD/VA Vision Center of Excellence, Crystal City, Virginia, United States