1. From The Ohio State University College of Optometry, Columbus, Ohio; the
2. School of Optometry, University of California, Berkeley, California; and the
3. Division of Epidemiology and Biometrics, The Ohio State University College of Medicine and Public Health, Columbus, Ohio.
4. From The Ohio State University College of Optometry, Columbus, Ohio; the3Division of Epidemiology and Biometrics, The Ohio State University College of Medicine and Public Health, Columbus, Ohio.