1. From The Ohio State University College of Optometry, Columbus, Ohio; the
2. Division of Epidemiology and Biometrics, The Ohio State University College of Medicine and Public Health, Columbus, Ohio; the
3. Southern California College of Optometry, Fullerton, California; the
4. School of Optometry, University of Alabama Birmingham, Birmingham, Alabama; the
5. College of Optometry, University of Houston, Houston, Texas; and the
6. Department of Ophthalmology, University of Arizona, Tucson, Arizona.