1. Department of Ophthalmology and Visual Sciences, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
2. Department of Optometry, School of Optometry, University of Alabama at Birmingham, Birmingham, AL, USA
3. Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, AL, USA
4. Department of Surgery, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA