1. Department of Ophthalmology and Visual Sciences, Case Western Reserve University and University Hospitals Eye Institute, Cleveland, Ohio
2. Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, Ohio
3. Department of Ophthalmology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas
4. Division of International Ophthalmology, Casey Eye Institute, Oregon Health Sciences University, Portland, Oregon
5. Wills Eye Institute, Jefferson University, Philadelphia, Pennsylvania
6. W. K. Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan
7. Department of Ophthalmology and Visual Sciences, Case Western Reserve University and University Hospitals Eye Institute, Cleveland, Ohio 2Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, Ohio