1. Department of Medicine and Population Health Research Institute, McMaster University and Hamilton Health Sciences, Hamilton, Ontario, Canada
2. Department of Biostatistical Sciences, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina
3. Department of Ophthalmology and Visual Sciences, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin
4. Case Western Reserve University and Cleveland VA Medical Center, Cleveland, Ohio
5. Memphis Veterans Affairs Medical Center, Memphis, Tennessee
6. Metrohealth System and Case Western Reserve University School of Medicine, Cleveland, Ohio
7. SUNY Downstate Medical Center and Kings Country Hospital Center, Brooklyn, New York
8. North Bronx Healthcare Network and Albert Einstein College of Medicine, Bronx, New York
9. National Eye Institute, National Institutes of Health, Bethesda, Maryland.