1. Department of Ophthalmology & Visual Sciences, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States
2. Doheny Eye Institute, Los Angeles, California, United States
3. Department of Ophthalmology, David Geffen School of Medicine at University of California, Los Angeles, California, United States
4. Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama, United States