1. Program in Liberal Medical Education, Brown University, Providence, Rhode Island, USA
2. Section of Ophthalmology, Providence VA Medical Center, Providence, Rhode Island, USA
3. Division of Ophthalmology, Alpert Medical School, Brown University, Providence, Rhode Island, USA
4. Departments of Ophthalmology and Public Health Sciences, Penn State College of Medicine, Hershey, PA, USA
5. Office of Academic Affiliations, Veterans Health Administration, US Department of Veterans Affairs, Washington, District of Columbia, USA